UARTS in kernel 4.4: no /dev/ttO* ?

[Matt]

Hi,

Working in kernel 4.4.16-bone-rt-r11 and am not seeing the corresponding entries in /dev/ for the enabled UARTS.

My custom DTS (BB-APA-01) enables a number of UARTS but I am not seeing the corresponding /dev/ttyO2, ttyO4, ttyO5, etc. 

Tried also loading the BB-UART2-00A0.dtbo from /lib/firmare/ as you can see below when I cat slots. 

root:~# cat /sys/devices/platform/bone_capemgr/slots
 0: PF----  -1
 1: PF----  -1
 2: PF----  -1
 3: PF----  -1
 4: P-O-L-   0 Override Board Name,00A0,Override Manuf,BB-APA-01
 5: P-O-L-   1 Override Board Name,00A0,Override Manuf,BB-ADC
 6: P-O-L-   2 Override Board Name,00A0,Override Manuf,BB-UART2


root:~# ls /dev/tty*
/dev/tty    /dev/tty19    /dev/tty3   /dev/tty40    /dev/tty51  /dev/tty62
/dev/tty0   /dev/tty2    /dev/tty30  /dev/tty41    /dev/tty52  /dev/tty63
/dev/tty1   /dev/tty20    /dev/tty31  /dev/tty42    /dev/tty53  /dev/tty7
/dev/tty10  /dev/tty21    /dev/tty32  /dev/tty43    /dev/tty54  /dev/tty8
/dev/tty11  /dev/tty22    /dev/tty33  /dev/tty44    /dev/tty55  /dev/tty9
/dev/tty12  /dev/tty23    /dev/tty34  /dev/tty45    /dev/tty56  /dev/ttyACM0
/dev/tty13  /dev/tty24    /dev/tty35  /dev/tty46    /dev/tty57  /dev/ttyS0
/dev/tty14  /dev/tty25    /dev/tty36  /dev/tty47    /dev/tty58  /dev/ttyS1
/dev/tty15  /dev/tty26    /dev/tty37  /dev/tty48    /dev/tty59  /dev/ttyS2
/dev/tty16  /dev/tty27    /dev/tty38  /dev/tty49    /dev/tty6   /dev/ttyS3
/dev/tty17  /dev/tty28    /dev/tty39  /dev/tty5    /dev/tty60  /dev/ttyS4
/dev/tty18  /dev/tty29    /dev/tty4   /dev/tty50    /dev/tty61  /dev/ttyS5


What am I missing here?  When a UART is loaded into slots should it then be labeld ttyOX in /dev just as in 3.18?

[Mike]

On 08/18/2016 05:57 PM, Matt wrote:
> Hi,
>
> Working in kernel 4.4.16-bone-rt-r11 and am not seeing the
> corresponding entries in /dev/ for the enabled UARTS.
>

> /dev/tty13 /dev/tty24 /dev/tty35 /dev/tty46 /dev/tty57 /dev/ttyS0
> /dev/tty14 /dev/tty25 /dev/tty36 /dev/tty47 /dev/tty58 /dev/ttyS1
> /dev/tty15 /dev/tty26 /dev/tty37 /dev/tty48 /dev/tty59 /dev/ttyS2
> /dev/tty16 /dev/tty27 /dev/tty38 /dev/tty49 /dev/tty6 /dev/ttyS3
> /dev/tty17 /dev/tty28 /dev/tty39 /dev/tty5 /dev/tty60 /dev/ttyS4
> /dev/tty18 /dev/tty29 /dev/tty4 /dev/tty50 /dev/tty61 /dev/ttyS5
>
>
> What am I missing here? When a UART is loaded into slots should it
> then be labeld ttyOX in /dev just as in 3.18?

> --

/dev/ttyS?

Mike

[Matt]

Don't think the ttyS's are it.  I know for sure in 3.18 you use the /ttyO2 or whatever number uart you enable.

Can anyone confirm that in 4.4 the UARTS show as /ttyS*  ?

Going to check my .dts.

[William Hermans]

william@beaglebone:~$ dmesg |grep tty
[    0.000000] Kernel command line: console=tty0 console=ttyO0,115200n8 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait ip        v6.disable=1
[    0.002187] console [tty0] enabled
[    0.002223] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[    1.998154] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, base_baud = 3000000) is a 8250
[    2.884801] console [ttyS0] enabled
william@beaglebone:~$ clear
william@beaglebone:~$ ls /sys/devices/
armv7_cortex_a8  breakpoint  platform  soc0  software  system  tracepoint  virtual
william@beaglebone:~$ ls /sys/devices/platform/
alarmtimer    cpufreq-dt        leds  omap-pcm-audio  pm33xx.0  power      serial8250  ti-cpufreq.0
bone_capemgr  fixedregulator@0  ocp   opp_table0      pmu       reg-dummy  soc         uevent
william@beaglebone:~$ cat /sys/devices/platform/bone_capemgr/slots

 0: PF----  -1
 1: PF----  -1
 2: PF----  -1
 3: PF----  -1

william@beaglebone:~$ ls /lib/firmware/ |grep UART
BB-UART1-00A0.dtbo
BB-UART2-00A0.dtbo
BB-UART2-RTSCTS-00A0.dtbo
BB-UART3-00A0.dtbo
BB-UART4-00A0.dtbo
BB-UART4-RS485-00A0.dtbo
BB-UART5-00A0.dtbo
william@beaglebone:~$ sudo sh -c"echo 'BB-UART2' > /sys/devices/platform/bone_capemgr/slots"
[sudo] password for william:
sh: 0: Illegal option -h
william@beaglebone:~$ sudo sh -c "echo 'BB-UART2' > /sys/devices/platform/bone_capemgr/slots"
william@beaglebone:~$ cat /sys/devices/platform/bone_capemgr/slots

 0: PF----  -1
 1: PF----  -1
 2: PF----  -1
 3: PF----  -1

 4: P-O-L-   0 Override Board Name,00A0,Override Manuf,BB-UART2
william@beaglebone:~$ dmesg |grep tty
[    0.000000] Kernel command line: console=tty0 console=ttyO0,115200n8 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait ip        v6.disable=1
[    0.002187] console [tty0] enabled
[    0.002223] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[    1.998154] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, base_baud = 3000000) is a 8250
[    2.884801] console [ttyS0] enabled
[778201.669492] 48024000.serial: ttyS2 at MMIO 0x48024000 (irq = 198, base_baud = 3000000) is a 8250

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[William Hermans]

william@beaglebone:~$ ls /sys/devices/platform/ocp/
40300000.ocmcram          48030000.spi    48060000.mmc                   48310000.rng       53500000.aes
40302000.ocmcram_nocache  48038000.mcasp  480c8000.mailbox               49000000.edma      56000000.sgx
44e07000.gpio             4803c000.mcasp  480ca000.spinlock              49800000.tptc      driver_override
44e09000.serial           48042000.timer  4819c000.i2c                   49900000.tptc      modalias
44e0b000.i2c              48044000.timer  481a0000.spi                   49a00000.tptc      ocp:l4_wkup@44c00000
44e35000.wdt              48046000.timer  481ac000.gpio                  4a100000.ethernet  of_node
44e3e000.rtc              48048000.timer  481ae000.gpio                  4a300000.pruss     power
47400000.usb              4804a000.timer  481d8000.mmc                   4c000000.emif      subsystem
48024000.serial           4804c000.gpio   48200000.interrupt-controller  53100000.sham      uevent
william@beaglebone:~$ ls /sys/devices/platform/ocp/48024000.serial
driver  driver_override  modalias  of_node  power  subsystem  tty  uevent
william@beaglebone:~$ ls /sys/devices/platform/ocp/48024000.serial/tty
ttyS2

[William Hermans]

william@beaglebone:~$ apt-cache search setserial
setserial - controls configuration of serial ports
william@beaglebone:~$ sudo apt-get install setserial
. . .
The following NEW packages will be installed:
  setserial
0 upgraded, 1 newly installed, 0 to remove and 13 not upgraded.
Need to get 49.9 kB of archives.
After this operation, 139 kB of additional disk space will be used.

william@beaglebone:~$ setserial -g /dev/ttyS[0-5]
/dev/ttyS0, UART: 8250, Port: 0x0000, IRQ: 158
/dev/ttyS1, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS2, UART: 8250, Port: 0x0000, IRQ: 198
/dev/ttyS3, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS4, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS5, UART: unknown, Port: 0x0000, IRQ: 0

[William Hermans]

http://bfy.tw/7Hr5

Anyhow, consider this horse beaten to death.

[Micka]

ttyO* is for the omap driver. If i'm not wrong the kernel 4.4 use the driver 8250. 

You can switch back to the omap driver i' the config of the kernel. 

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[Matt]

Thanks for the info guys. 

Why is it that ttyS* are all listed when no BB-UART has been loaded into slots?

Work flow before was straight forward:
- Load a .dtbo
- Corresponding /ttyO* loaded.

Now I am unsure. When the BBB boots it shows all the /dev/ttyS*
Do I still have to load the corresponding .dtbo's?
Do I have to run the command

setserial -g /dev/ttyS[0-5]

to bring up UARTS after every boot?