Facing issue in loading UART for Beaglebone debian

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Sharvin Shah

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May 2, 2019, 9:33:48 AM5/2/19
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I am facing issue in loading uart port for Beaglebone Debian.

Following are my configurations:

I have a beaglebone with Debian OS. I have an sd card with 4 Partitions.

Partition 1 ( mmcblk0p1 ) contains following bootloader configurations:-

  1. /boot/dtbs/4.14.71-ti-r80/am335x-bonegreen-wireless.dtb
  2. /boot/vmlinuz-4.14.71-ti-r80
  3. /boot/uEnv.txt
  4. /boot/initrd.img-4.14.71-ti-r80
  5. /lib/firmware/BB-UART4-00A0.dtbo
  6. /lib/firmware/BB-UART1-00A0.dtbo
  7. /lib/firmware/BB-I2C2-00A0.dtbo
  8. /lib/firmware/AM335X-PRU-UIO-00A0.dtbo
  9. /lib/firmware/BB-BBGW-WL1835-00A0.dtbo
  10. /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo
  11. /lib/firmware/BB-ADC-00A0.dtbo
  12. /uEnv.txt

Partition 2 ( mmcblk0p2 ) contains the Debian OS.

Partition 3 ( mmcblk0p3 ) contains another Debian OS.

Partition 4 ( mmcblk0p4 ) decides from Which partition to boot?

/uEnv.txt from mmcblk0p1 reads from mmcblk0p4 and decides from which partition to boot.

This is my /uEnv.txt:

rdaddr=0x88080000

initrd_high=0xffffffff
fdt_high=0xffffffff

loadxrd=echo debug: [/boot/initrd.img-${uname_r}] ... ; load mmc 0:1 ${rdaddr} /boot/initrd.img-${uname_r}; setenv rdsize ${filesize}
loaduEnvtxt=load mmc 0:1 ${loadaddr} /boot/uEnv.txt ; env import -t ${loadaddr} ${filesize};
check_dtb=if test -n ${dtb}; then setenv fdtfile ${dtb};fi;
check_uboot_overlays=if test -n ${enable_uboot_overlays}; then setenv enable_uboot_overlays ;fi;

loadall=run loaduEnvtxt; run check_dtb; run check_uboot_overlays; run loadxrd;

rootpart=0:2
flagpart=0:4
bootdir=/boot
bootfile=vmlinuz-4.14.71-ti-r80
console=ttyO0,115200n8
fdtaddr=0x88000000
fdtfile=am335x-bonegreen-wireless.dtb
loadaddr=0x82000000
mmcroot=/dev/mmcblk0p2 ro
mmcrootfstype=ext4 rootwait

mmcargs=setenv bootargs console=${console} ${optargs} ${cape_disable} ${cape_enable} root=${mmcroot} rootfstype=${mmcrootfstype} ${cmdline}

loadfdt=echo debug: [/boot/dtbs/${uname_r}/${fdtfile}] ... ;load mmc 0:1 ${fdtaddr} /boot/dtbs/${uname_r}/${fdtfile}

loadimage=echo debug: [/boot/vmlinuz-${uname_r}] ... ; load mmc 0:1 ${loadaddr} /boot/vmlinuz-${uname_r}

boot_three=setenv rootpart 0:3; setenv mmcroot /dev/mmcblk0p3 ro

findroot=\
    if test -e mmc $flagpart three; then \
        if test -e mmc $flagpart three_ok; then \
            run boot_three; \
        elif test ! -e mmc $flagpart three_tried; then \
            fatwrite mmc $flagpart $loadaddr three_tried 4; \
            run boot_three; \
        fi; \
    elif test -e mmc $flagpart two; then \
        if test ! -e mmc $flagpart two_ok; then \
            if test -e mmc $flagpart two_tried; then \
                run boot_three; \
            else \
                fatwrite mmc $flagpart $loadaddr two_tried 4; \
            fi; \
        fi; \
    fi;
uenvcmd=\
    run loadall; \
    run findroot; \
    echo Using root partition ${rootpart}; \
    if run loadfdt; then \
        echo Loaded ${fdtfile}; \
        if run loadimage; then \
            run mmcargs; \
            bootz ${loadaddr} - ${fdtaddr}; \
        fi; \
    fi;


In /boot/uEnv.txt I have enabled following Configs:

uname_r=4.14.71-ti-r80
enable_uboot_overlays
=1
uboot_overlay_addr0
=/lib/firmware/BB-UART4-00A0.dtbo
uboot_overlay_addr1
=/lib/firmware/BB-UART1-00A0.dtbo
uboot_overlay_addr2
=/lib/firmware/BB-I2C2-00A0.dtbo
uboot_overlay_pru
=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo
enable_uboot_cape_universal
=1
cmdline
=coherent_pool=1M net.ifnames=0 quiet


My Boot logs:


U-Boot SPL 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500)
Trying to boot from MMC2
Loading Environment from EXT4...
** Unable to use mmc 0:1 for loading the env **


U
-Boot 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500), Build: jenkins-github_Bootloader-Builder-65

CPU  
: AM335X-GP rev 2.1
I2C
:   ready
DRAM
:  512 MiB
No match for driver 'omap_hsmmc'
No match for driver 'omap_hsmmc'
Some drivers were not found
Reset Source: Power-on reset has occurred.
RTC
32KCLK Source: External.
MMC
:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from EXT4...
** Unable to use mmc 0:1 for loading the env **
Board: BeagleBone Black
<ethaddr> not set. Validating first E-fuse MAC
BeagleBone Black:
Model: SeeedStudio BeagleBone Green Wireless:
BeagleBone: cape eeprom: i2c_probe: 0x54:
BeagleBone: cape eeprom: i2c_probe: 0x55:
BeagleBone: cape eeprom: i2c_probe: 0x56:
BeagleBone: cape eeprom: i2c_probe: 0x57:
Net:   eth0: MII MODE
Could not get PHY for cpsw: addr 0
cpsw
, usb_ether
Press SPACE to abort autoboot in 2 seconds
board_name
=[A335BNLT] ...
board_rev
=[GW1A] ...
switch to partitions #0, OK
mmc0
is current device
SD
/MMC found on device 0
switch to partitions #0, OK
mmc0
is current device
Scanning mmc 0:1...
60067 bytes read in 6 ms (9.5 MiB/s)
gpio
: pin 56 (gpio 56) value is 0
gpio
: pin 55 (gpio 55) value is 0
gpio
: pin 54 (gpio 54) value is 0
gpio
: pin 53 (gpio 53) value is 1
switch to partitions #0, OK
mmc0
is current device
gpio
: pin 54 (gpio 54) value is 1
Checking for: /uEnv.txt ...
2628 bytes read in 2 ms (1.3 MiB/
s)
gpio
: pin 55 (gpio 55) value is 1
Loaded environment from /uEnv.txt
Importing environment from mmc ...
Checking if uenvcmd is set ...
gpio
: pin 56 (gpio 56) value is 1
Running uenvcmd ...
2113 bytes read in 3 ms (687.5 KiB/s)
debug
: [/boot/initrd.img-4.14.71-ti-r80] ...
4799493 bytes read in 303 ms (15.1 MiB/s)
Using root partition 0:2
debug
: [/boot/dtbs/4.14.71-ti-r80/am335x-bonegreen-wireless.dtb] ...
60067 bytes read in 8 ms (7.2 MiB/s)
Loaded am335x-bonegreen-wireless.dtb
debug
: [/boot/vmlinuz-4.14.71-ti-r80] ...
10416640 bytes read in 652 ms (15.2 MiB/s)
## Flattened Device Tree blob at 88000000
   
Booting using the fdt blob at 0x88000000
   
Using Device Tree in place at 88000000, end 88011aa2

Starting kernel ...

[    0.000749] timer_probe: no matching timers found
[    0.783193] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
[    1.073624] omap_voltage_late_init: Voltage driver support not added
[    1.080550] PM: Cannot get wkup_m3_ipc handle


Question:

Now when I boot into the partition and check for the UART port I am unable to find them.

ls -l /dev/ttyO*
lrwxrwxrwx 1 root root 5 Nov  3  2016 /dev/ttyO0 -> ttyS0
lrwxrwxrwx 1 root root 5 Nov  3  2016 /dev/ttyO2 -> ttyS2


The output I am expecting is:

lrwxrwxrwx 1 root root 5 Nov  3  2016 /dev/ttyO0 -> ttyS0
lrwxrwxrwx 1 root root 5 Nov  3  2016 /dev/ttyO1 -> ttyS1
lrwxrwxrwx 1 root root 5 Nov  3  2016 /dev/ttyO2 -> ttyS2
lrwxrwxrwx 1 root root 5 Nov  3  2016 /dev/ttyO3 -> ttyS3
lrwxrwxrwx 1 root root 5 Nov  3  2016 /dev/ttyO4 -> ttyS4
lrwxrwxrwx 1 root root 5 Nov  3  2016 /dev/ttyO5 -> ttyS5

Robert Nelson

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May 2, 2019, 9:38:40 AM5/2/19
to Beagle Board, sharvi...@gmail.com
> Loaded environment from /uEnv.txt
> Importing environment from mmc ...
> Checking if uenvcmd is set ...
> gpio: pin 56 (gpio 56) value is 1
> Running uenvcmd ...

You are using the "uenvcmd" path, it's up to "YOU" to load the overlays.

Regards,

--
Robert Nelson
https://rcn-ee.com/

Sharvin Shah

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May 3, 2019, 1:09:58 AM5/3/19
to BeagleBoard
Yes, I'm loading the Overlays. In my uEnv.txt I am running loadall which loads the /boot/uEnv.txt. What am I doing wrong here or what am I missing here?

Robert Nelson

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May 3, 2019, 1:22:42 AM5/3/19
to Beagle Board, sharvi...@gmail.com


On Fri, May 3, 2019, 12:10 AM Sharvin Shah <sharvi...@gmail.com> wrote:
Yes, I'm loading the Overlays. In my uEnv.txt I am running loadall which loads the /boot/uEnv.txt. What am I doing wrong here or what am I missing here?

Uh nope, your assumption is incorrect.

while loadall, loads the variables from /boot/uEnv.txt, the overlay path thru uboot is NOT enabled...

Why isn't it enabled?  Well I did not write it for that path, because old uboot + doing Overlays = uboot hard faults..

So to repeat..

You are using the "uenvcmd" path, it's up to "YOU" to load the overlays in your uboot script.

Regards,

Sharvin Shah

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May 3, 2019, 1:35:34 AM5/3/19
to BeagleBoard
Okay, I see your point.

Just for verification purpose, you are talking about check_uboot_overlays from the script right?

Also, How can I enable the overlay path through uboot? 

Thank you

Robert Nelson

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May 3, 2019, 10:10:32 AM5/3/19
to Beagle Board, sharvi...@gmail.com
On Fri, May 3, 2019 at 12:35 AM Sharvin Shah <sharvi...@gmail.com> wrote:
>
> Okay, I see your point.
>
> Just for verification purpose, you are talking about check_uboot_overlays from the script right?

so let's look at your script, and what u-boot did

uenvcmd=\
run loadall; \
run findroot; \
echo Using root partition ${rootpart}; \
if run loadfdt; then \
echo Loaded ${fdtfile}; \
if run loadimage; then \
run mmcargs; \
bootz ${loadaddr} - ${fdtaddr}; \
fi; \
fi;

loadadd:

loadall=run loaduEnvtxt; run check_dtb; run check_uboot_overlays; run loadxrd;

Okay, so we load /boot/uEnv.txt, select the defined dtb, check if
"enable_uboot_overlays" is enabled.. Finally we load the initrd..

loadxrd=echo debug: [/boot/initrd.img-${uname_r}] ... ; load mmc 0:1
${rdaddr} /boot/initrd.img-${uname_r}; setenv rdsize ${filesize}

findroot;

Set's root mmc..

loadfdt;

Loads the device tree:

loadfdt=echo debug: [/boot/dtbs/${uname_r}/${fdtfile}] ... ;load mmc
0:1 ${fdtaddr} /boot/dtbs/${uname_r}/${fdtfile}

loadimage

Loads the zImage..

loadimage=echo debug: [/boot/vmlinuz-${uname_r}] ... ; load mmc 0:1
${loadaddr} /boot/vmlinuz-${uname_r}

mmcargs, set's the mmcargs var..

mmcargs=setenv bootargs console=${console} ${optargs} ${cape_disable}
${cape_enable} root=${mmcroot} rootfstype=${mmcrootfstype} ${cmdline}

bootz ${loadaddr} - ${fdtaddr};

aka boot into linux..

Then we look at what u-boot did:

********************************************
Running uenvcmd ...
2113 bytes read in 3 ms (687.5 KiB/s)
debug: [/boot/initrd.img-4.14.71-ti-r80] ...
4799493 bytes read in 303 ms (15.1 MiB/s)
Using root partition 0:2
debug: [/boot/dtbs/4.14.71-ti-r80/am335x-bonegreen-wireless.dtb] ...
60067 bytes read in 8 ms (7.2 MiB/s)
Loaded am335x-bonegreen-wireless.dtb
debug: [/boot/vmlinuz-4.14.71-ti-r80] ...
10416640 bytes read in 652 ms (15.2 MiB/s)
## Flattened Device Tree blob at 88000000
Booting using the fdt blob at 0x88000000
Using Device Tree in place at 88000000, end 88011aa2
********************************************

So your "run check_uboot_overlays;" did nothing...

> Also, How can I enable the overlay path through uboot?

/uEnv.txt = uenvcmd = YOU WRITE IT

/boot/uEnv.txt = (default) we take care of it..


"Current Loaded" *.dtb in address ${fdtaddr} and a second scratch
adddress using ${rdaddr}

setenv fdt_buffer 0x60000;
load ${devtype} ${bootpart} ${rdaddr} ${uboot_overlay}
fdt addr ${fdtaddr}
fdt resize ${fdt_buffer}
fdt apply ${rdaddr}
fdt resize ${fdt_buffer}

Sharvin Shah

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May 4, 2019, 3:16:55 AM5/4/19
to BeagleBoard
Still, I am unable to understand How can I enable the overlays and load the UART Port.

What I did was I add these lines in my /uEnv.txt under uenvcmd:

rdaddr=0x88080000

initrd_high=0xffffffff
fdt_high=0xffffffff

loadxrd=echo debug1: [/boot/initrd.img-${uname_r}] ... ; load mmc 0:1 ${rdaddr} /boot/initrd.img-${uname_r}; setenv rdsize ${filesize}
loaduEnvtxt=echo debug1 loading uEnv.txt ... ; load mmc 0:1 ${loadaddr} /boot/uEnv.txt ; env import -t ${loadaddr} ${filesize};
check_dtb=echo debug1 loading check_dtb ... ; if test -n ${dtb}; then setenv fdtfile ${dtb};fi;
check_uboot_overlays=echo debug1 loading check_uboot_overlays ... ; if test -n ${enable_uboot_overlays}; then setenv enable_uboot_overlays ;fi;

loadall=run loaduEnvtxt; run check_dtb; run check_uboot_overlays; run loadxrd;

rootpart=0:2
flagpart=0:4
bootdir=/boot
bootfile=vmlinuz-4.14.71-ti-r80
console=ttyO0,115200n8
fdtaddr=0x88000000
fdtfile=am335x-bonegreen-wireless.dtb
loadaddr=0x82000000
mmcroot=/dev/mmcblk0p2 ro
mmcrootfstype=ext4 rootwait

mmcargs=setenv bootargs console=${console} ${optargs} ${cape_disable} ${cape_enable} root=${mmcroot} rootfstype=${mmcrootfstype} ${cmdline}

loadfdt=echo debug1: [/boot/dtbs/${uname_r}/${fdtfile}] ... ;load mmc 0:1 ${fdtaddr} /boot/dtbs/${uname_r}/${fdtfile}

loadimage=echo debug1: [/boot/vmlinuz-${uname_r}] ... ; load mmc 0:1 ${loadaddr} /boot/vmlinuz-${uname_r}

boot_three=setenv rootpart 0:3; setenv mmcroot /dev/mmcblk0p3 ro

findroot=\
if test -e mmc $flagpart three; then \
if test -e mmc $flagpart three_ok; then \
run boot_three; \
elif test ! -e mmc $flagpart three_tried; then \
fatwrite mmc $flagpart $loadaddr three_tried 4; \
run boot_three; \
fi; \
elif test -e mmc $flagpart two; then \
if test ! -e mmc $flagpart two_ok; then \
if test -e mmc $flagpart two_tried; then \
run boot_three; \
else \
fatwrite mmc $flagpart $loadaddr two_tried 4; \
fi; \
fi; \
fi;
uenvcmd=\
run loadall; \
run findroot; \
echo Using root partition ${rootpart}; \
setenv fdt_buffer 0x60000; \
load ${devtype} ${bootpart} ${rdaddr} ${uboot_overlay}; \
fdt addr ${fdtaddr}; \
fdt resize ${fdt_buffer}; \
fdt apply ${rdaddr}; \
fdt resize ${fdt_buffer}; \
        echo Done with the edit; \
if run loadfdt; then \
echo Loaded ${fdtfile}; \
if run loadimage; then \
run mmcargs; \
bootz ${loadaddr} - ${fdtaddr}; \
fi; \
fi;

It loaded the UART Port and tried to boot to the Partition 1 But this failed as partition 1 has no Os image

Boot logs:

U-Boot SPL 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500)
Trying to boot from MMC2
Loading Environment from EXT4... Card did not respond to voltage select!


U-Boot 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500), Build: jenkin
s-github_Bootloader-Builder-65

CPU  : AM335X-GP rev 2.1
I2C:   ready
DRAM:  512 MiB
No match for driver 'omap_hsmmc'
No match for driver 'omap_hsmmc'
Some drivers were not found
Reset Source: Power-on reset has occurred.
RTC 32KCLK Source: External.
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from EXT4... Card did not respond to voltage select!
Board: BeagleBone Black
<ethaddr> not set. Validating first E-fuse MAC
BeagleBone Black:
Model: SeeedStudio BeagleBone Green Wireless:
BeagleBone: cape eeprom: i2c_probe: 0x54:
BeagleBone: cape eeprom: i2c_probe: 0x55:
BeagleBone: cape eeprom: i2c_probe: 0x56:
BeagleBone: cape eeprom: i2c_probe: 0x57:
Net:   eth0: MII MODE
Could not get PHY for cpsw: addr 0
cpsw, usb_ether
Press SPACE to abort autoboot in 2 seconds
board_name=[A335BNLT] ...
board_rev=[GW1A] ...
SD/MMC found on device 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
60067 bytes read in 5 ms (11.5 MiB/s)
gpio: pin 56 (gpio 56) value is 0
gpio: pin 55 (gpio 55) value is 0
gpio: pin 54 (gpio 54) value is 0
gpio: pin 53 (gpio 53) value is 1
switch to partitions #0, OK
mmc0 is current device
gpio: pin 54 (gpio 54) value is 1
Checking for: /uEnv.txt ...
2261 bytes read in 2 ms (1.1 MiB/s)
gpio: pin 55 (gpio 55) value is 1
Loaded environment from /uEnv.txt
Importing environment from mmc ...
Checking if uenvcmd is set ...
gpio: pin 56 (gpio 56) value is 1
Running uenvcmd ...
debug1 loading uEnv.txt ...
2176 bytes read in 3 ms (708 KiB/s)
debug1 loading check_dtb ...
debug1 loading check_uboot_overlays ...
debug1: [/boot/initrd.img-4.14.71-ti-r80] ...
4799493 bytes read in 302 ms (15.2 MiB/s)
Using root partition 0:2
10416640 bytes read in 652 ms (15.2 MiB/s)
Checking if client_ip is set ...
Checking for: /boot.scr ...
Checking for: /boot/boot.scr ...
Checking for: /boot/uEnv.txt ...
gpio: pin 55 (gpio 55) value is 1
2176 bytes read in 3 ms (708 KiB/s)
Loaded environment from /boot/uEnv.txt
Checking if uname_r is set in /boot/uEnv.txt...
gpio: pin 56 (gpio 56) value is 1
Running uname_boot ...
loading /boot/vmlinuz-4.14.71-ti-r80 ...
debug1: [/boot/vmlinuz-4.14.71-ti-r80] ...
10416640 bytes read in 653 ms (15.2 MiB/s)
debug: [enable_uboot_overlays=1] ...
debug: [enable_uboot_cape_universal=1] ...
debug: [uboot_base_dtb_univ=am335x-bonegreen-wireless-uboot-univ.dtb] ...
uboot_overlays: [uboot_base_dtb=am335x-bonegreen-wireless-uboot-univ.dtb] ...
uboot_overlays: Switching too: dtb=am335x-bonegreen-wireless-uboot-univ.dtb ...
debug1: [/boot/dtbs/4.14.71-ti-r80/am335x-bonegreen-wireless-uboot-univ.dtb] ...
156290 bytes read in 14 ms (10.6 MiB/s)
uboot_overlays: [fdt_buffer=0x60000] ...
uboot_overlays: loading /lib/firmware/BB-UART4-00A0.dtbo ...
1075 bytes read in 3 ms (349.6 KiB/s)
uboot_overlays: loading /lib/firmware/BB-UART1-00A0.dtbo ...
1075 bytes read in 2 ms (524.4 KiB/s)
uboot_overlays: loading /lib/firmware/BB-I2C2-00A0.dtbo ...
1152 bytes read in 2 ms (562.5 KiB/s)
uboot_overlays: loading /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo ...
1440 bytes read in 3 ms (468.8 KiB/s)
uboot_overlays: loading /lib/firmware/BB-BBGW-WL1835-00A0.dtbo ...
4839 bytes read in 3 ms (1.5 MiB/s)
uboot_overlays: loading /lib/firmware/BB-ADC-00A0.dtbo ...
711 bytes read in 3 ms (231.4 KiB/s)
uboot_overlays: loading /lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo ...
2402 bytes read in 4 ms (585.9 KiB/s)
loading /boot/initrd.img-4.14.71-ti-r80 ...
4799493 bytes read in 302 ms (15.2 MiB/s)
debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet] ...
debug: [bootz 0x82000000 0x88080000:493c05 88000000] ...
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   reserving fdt memory region: addr=88000000 size=88000
   Using Device Tree in place at 88000000, end 8808afff

Starting kernel ...

[    0.002060] timer_probe: no matching timers found
[    1.135903] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
[    1.486326] omap_voltage_late_init: Voltage driver support not added
[    1.493305] PM: Cannot get wkup_m3_ipc handle
mount: mounting /dev/mmcblk0p1 on /root failed: Invalid argument
mount: mounting /dev on /root/dev failed: No such file or directory
mount: mounting /dev on /root/dev failed: No such file or directory
mount: mounting /run on /root/run failed: No such file or directory
run-init: current directory on the same filesystem as the root: error 0
Target filesystem doesn't have requested /sbin/init.
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
No init found. Try passing init= bootarg.


BusyBox v1.22.1 (Debian 1:1.22.0-19+b3) built-in shell (ash)
Enter 'help' for a list of built-in commands.


 
What am I doing wrong here? How can I boot from partition2 or partition 3 while loading all the UART Port?

Robert Nelson

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May 4, 2019, 10:35:12 AM5/4/19
to Beagle Board, sharvi...@gmail.com
> uenvcmd=\
> run loadall; \
> run findroot; \
> echo Using root partition ${rootpart}; \
> setenv fdt_buffer 0x60000; \
> load ${devtype} ${bootpart} ${rdaddr} ${uboot_overlay}; \
> fdt addr ${fdtaddr}; \
> fdt resize ${fdt_buffer}; \
> fdt apply ${rdaddr}; \
> fdt resize ${fdt_buffer}; \
> echo Done with the edit; \
> if run loadfdt; then \
> echo Loaded ${fdtfile}; \

Wrong order, you placed my "reference example" before the you loaded
the main dtb. ( i also didn't expect you'd just copy it as is.. so
let's expand it more..)

```
if run loadfdt; then \
echo Loaded ${fdtfile}; \
setenv fdt_buffer 0x60000; \
load mmc 0:1 ${rdaddr} /lib/firmware/BB-UART4-00A0.dtbo; \
fdt addr ${fdtaddr}; \
fdt resize ${fdt_buffer}; \
fdt apply ${rdaddr}; \
fdt resize ${fdt_buffer}; \
load mmc 0:1 ${rdaddr} /lib/firmware/BB-UART1-00A0.dtbo; \
fdt addr ${fdtaddr}; \
fdt resize ${fdt_buffer}; \
fdt apply ${rdaddr}; \
fdt resize ${fdt_buffer}; \
<and so on>
<and so on>
if run loadimage; then \
run mmcargs; \
bootz ${loadaddr} - ${fdtaddr}; \
fi; \
fi;
```

Does that now make sense?
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Sharvin Shah

unread,
May 6, 2019, 4:35:36 AM5/6/19
to BeagleBoard
When I add under if run loadfdt; then \  This is working properly

setenv fdt_buffer 0x60000; \
fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART4-00A0.dtbo; \        
fdt addr $
{fdtaddr}; \
fdt resize ${fdt_buffer}; \
fdt apply $
{rdaddr}; \
fdt resize $
{fdt_buffer}; \
fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART1-00A0.dtbo; \

But When I add anything under fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART1-00A0.dtbo; \ 

Uboot starts booting in a different way. 

uEnv.txt:

rdaddr=0x88080000

initrd_high=0xffffffff
fdt_high=0xffffffff

loadxrd=echo debug: [/boot/initrd.img-${uname_r}] ... ; load mmc 0:1 ${rdaddr} /boot/initrd.img-${uname_r}; setenv rdsize ${filesize}
loaduEnvtxt=load mmc 0:1 ${loadaddr} /boot/uEnv.txt ; env import -t ${loadaddr} ${filesize};
check_dtb=if test -n ${dtb}; then setenv fdtfile ${dtb};fi;
check_uboot_overlays=if test -n ${enable_uboot_overlays}; then setenv enable_uboot_overlays ;fi;

loadall=run loaduEnvtxt; run check_dtb; run check_uboot_overlays; run loadxrd;

rootpart=0:2
flagpart=0:4
bootdir=/boot
bootfile=vmlinuz-4.14.71-ti-r80
console=ttyO0,115200n8
fdtaddr=0x88000000
fdtfile=am335x-bonegreen-wireless.dtb
loadaddr=0x82000000
mmcroot=/dev/mmcblk0p2 ro
mmcrootfstype=ext4 rootwait

mmcargs=setenv bootargs console=${console} ${optargs} ${cape_disable} ${cape_enable} root=${mmcroot} rootfstype=${mmcrootfstype} ${cmdline}

loadfdt=echo debug: [/boot/dtbs/${uname_r}/${fdtfile}] ... ;load mmc 0:1 ${fdtaddr} /boot/dtbs/${uname_r}/${fdtfile}

loadimage=echo debug: [/boot/vmlinuz-${uname_r}] ... ; load mmc 0:1 ${loadaddr} /boot/vmlinuz-${uname_r}

boot_three=setenv rootpart 0:3; setenv mmcroot /dev/mmcblk0p3 ro

findroot=\
if test -e mmc $flagpart three; then \
if test -e mmc $flagpart three_ok; then \
run boot_three; \
elif test ! -e mmc $flagpart three_tried; then \
fatwrite mmc $flagpart $loadaddr three_tried 4; \
run boot_three; \
fi; \
elif test -e mmc $flagpart two; then \
if test ! -e mmc $flagpart two_ok; then \
if test -e mmc $flagpart two_tried; then \
run boot_three; \
else \
fatwrite mmc $flagpart $loadaddr two_tried 4; \
fi; \
fi; \
fi;
uenvcmd=\
run loadall; \
run findroot; \
echo Using root partition ${rootpart}; \
if run loadfdt; then \
echo Inside loadfdt; \
setenv fdt_buffer 0x60000; \
fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART4-00A0.dtbo; \
echo I have loaded BB-UART4-00A0.dtbo; \
fdt addr ${fdtaddr}; \
fdt resize ${fdt_buffer}; \
fdt apply ${rdaddr}; \
fdt resize ${fdt_buffer}; \
fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART1-00A0.dtbo; \
echo I have loaded BB-UART1-00A0.dtbo; \
if run loadimage; then \
run mmcargs; \
bootz ${loadaddr} - ${fdtaddr}; \
fi; \
fi;

Boot logs:

U-Boot SPL 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500)
Trying to boot from MMC2
Loading Environment from EXT4...
** Unable to use mmc 0:1 for loading the env **


U-Boot 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500), Build: jenkin
s-github_Bootloader-Builder-65

CPU  : AM335X-GP rev 2.1
I2C:   ready
DRAM:  512 MiB
No match for driver 'omap_hsmmc'
No match for driver 'omap_hsmmc'
Some drivers were not found
Reset Source: Power-on reset has occurred.
RTC 32KCLK Source: External.
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from EXT4...
** Unable to use mmc 0:1 for loading the env **
Board: BeagleBone Black
<ethaddr> not set. Validating first E-fuse MAC
BeagleBone Black:
Model: SeeedStudio BeagleBone Green Wireless:
BeagleBone: cape eeprom: i2c_probe: 0x54:
BeagleBone: cape eeprom: i2c_probe: 0x55:
BeagleBone: cape eeprom: i2c_probe: 0x56:
BeagleBone: cape eeprom: i2c_probe: 0x57:
Net:   eth0: MII MODE
Could not get PHY for cpsw: addr 0
cpsw, usb_ether
Press SPACE to abort autoboot in 2 seconds
board_name=[A335BNLT] ...
board_rev=[GW1A] ...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
60067 bytes read in 5 ms (11.5 MiB/s)
gpio: pin 56 (gpio 56) value is 0
gpio: pin 55 (gpio 55) value is 0
gpio: pin 54 (gpio 54) value is 0
gpio: pin 53 (gpio 53) value is 1
switch to partitions #0, OK
mmc0 is current device
gpio: pin 54 (gpio 54) value is 1
Checking for: /uEnv.txt ...
2257 bytes read in 2 ms (1.1 MiB/s)
gpio: pin 55 (gpio 55) value is 1
Loaded environment from /uEnv.txt
Importing environment from mmc ...
Checking if uenvcmd is set ...
test - minimal test like /bin/sh

Usage:
test [args..]
Checking if client_ip is set ...
Checking for: /boot.scr ...
Checking for: /boot/boot.scr ...
Checking for: /boot/uEnv.txt ...
gpio: pin 55 (gpio 55) value is 1
2176 bytes read in 3 ms (708 KiB/s)
Loaded environment from /boot/uEnv.txt
Checking if uname_r is set in /boot/uEnv.txt...
gpio: pin 56 (gpio 56) value is 1
Running uname_boot ...
loading /boot/vmlinuz-4.14.71-ti-r80 ...
debug: [/boot/vmlinuz-4.14.71-ti-r80] ...
10416640 bytes read in 652 ms (15.2 MiB/s)
debug: [enable_uboot_overlays=1] ...
debug: [enable_uboot_cape_universal=1] ...
debug: [uboot_base_dtb_univ=am335x-bonegreen-wireless-uboot-univ.dtb] ...
uboot_overlays: [uboot_base_dtb=am335x-bonegreen-wireless-uboot-univ.dtb] ...
uboot_overlays: Switching too: dtb=am335x-bonegreen-wireless-uboot-univ.dtb ...
debug: [/boot/dtbs/4.14.71-ti-r80/am335x-bonegreen-wireless-uboot-univ.dtb] ...
156290 bytes read in 14 ms (10.6 MiB/s)
uboot_overlays: [fdt_buffer=0x60000] ...
uboot_overlays: loading /lib/firmware/BB-UART4-00A0.dtbo ...
1075 bytes read in 3 ms (349.6 KiB/s)
uboot_overlays: loading /lib/firmware/BB-UART1-00A0.dtbo ...
1075 bytes read in 3 ms (349.6 KiB/s)
uboot_overlays: loading /lib/firmware/BB-I2C2-00A0.dtbo ...
1152 bytes read in 3 ms (375 KiB/s)
uboot_overlays: loading /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo ...
1440 bytes read in 3 ms (468.8 KiB/s)
uboot_overlays: loading /lib/firmware/BB-BBGW-WL1835-00A0.dtbo ...
4839 bytes read in 3 ms (1.5 MiB/s)
uboot_overlays: loading /lib/firmware/BB-ADC-00A0.dtbo ...
711 bytes read in 3 ms (231.4 KiB/s)
uboot_overlays: loading /lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo ...
2402 bytes read in 3 ms (781.3 KiB/s)
loading /boot/initrd.img-4.14.71-ti-r80 ...
4799493 bytes read in 303 ms (15.1 MiB/s)
debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet] ...
debug: [bootz 0x82000000 0x88080000:493c05 88000000] ...
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   reserving fdt memory region: addr=88000000 size=88000
   Using Device Tree in place at 88000000, end 8808afff

Starting kernel ...

[    0.002080] timer_probe: no matching timers found
[    1.135823] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
[    1.486352] omap_voltage_late_init: Voltage driver support not added
[    1.493340] PM: Cannot get wkup_m3_ipc handle
mount: mounting /dev/mmcblk0p1 on /root failed: Invalid argument
mount: mounting /dev on /root/dev failed: No such file or directory
mount: mounting /dev on /root/dev failed: No such file or directory
mount: mounting /run on /root/run failed: No such file or directory
run-init: current directory on the same filesystem as the root: error 0
Target filesystem doesn't have requested /sbin/init.
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
No init found. Try passing init= bootarg.


BusyBox v1.22.1 (Debian 1:1.22.0-19+b3) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

Sharvin Shah

unread,
May 6, 2019, 4:36:18 AM5/6/19
to BeagleBoard
It boots into 1st partition I am unable to understand this behaviour

Sharvin Shah

unread,
May 8, 2019, 3:09:24 AM5/8/19
to BeagleBoard
Hello Robert

I am still facing the issue for loading the UART Port

Thanks
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