FLASH_ISR overflow

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Erik B Beall

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Dec 26, 2014, 11:45:22 PM12/26/14
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I've been trying to add a python submodule and in the last linking command it fails. I've made the module based on the mlx90620 submodule (code is inside omv/py, modded Makefiles, hooks added to omv/main.c, micropython/stmhal/qstrdefsport.h and micropython/stmhal/mpconfigport.h), The code has functions to init/deinit/read/write a 16-bit SPI interface. However, it overflows the ISR part of FLASH (first 16KB). I've been removing little bits of other code to see if that allows it to fit, but with no success so far. I didn't think these would take up so much room in the ISR region, is there something I'm missing? I'm using the gcc-arm-none-eabi=4.8.4.2014q3-0trusty11 ARM version of gcc. Here are the last four lines of "make" in the src/ subdirectory:

arm-none-eabi-cpp -P -E -DOPENMV1 omv/stm32f4xx.ld.S > /home/ebeall/openmv/src/build/stm32f4xx.lds
arm-none-eabi-gcc -mcpu=cortex-m4 -mabi=aapcs-linux -mthumb -mlittle-endian -mfloat-abi=hard -mfpu=fpv4-sp-d16 -nostdlib -Wl,--gc-sections -Wl,-T/home/ebeall/openmv/src/build/stm32f4xx.lds <ALL THE COMPILED BITS> -o /home/ebeall/openmv/src/build/openmv.elf
/usr/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: /home/ebeall/openmv/src/build/openmv.elf section `.isr_vector' will not fit in region `FLASH_ISR'
/usr/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: region `FLASH_ISR' overflowed by 92 bytes

For a test, I changed the ISR_LENGTH to 17KB in omv/stm32f4xx.ld.S and it links/compiles fine, but from what I've read (https://github.com/micropython/micropython/issues/69) it sounds like 16KB for ISR is a hard limit? Does anybody know what I'm doing wrong?

Michael Shimniok

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Dec 26, 2014, 11:58:12 PM12/26/14
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interesting. I ran into the same problem today but was trying to compile for f429. I will have to undo changes and retry. 

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Ibrahim Abdelkader

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Dec 27, 2014, 7:34:37 AM12/27/14
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Just remove object files from the ISR section, I was trying to fit as much code as I can into the ISR section, to save flash, you won't need to do that with 1/2MBs flash, you can remove all *.o from the ISR if you want (except the ISR of course).

Erik B Beall

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Dec 27, 2014, 10:36:01 PM12/27/14
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Ah, I see. Done, and compiles fine. Thanks Ibrahim!

Michael Shimniok

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Jan 2, 2015, 1:28:15 PM1/2/15
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On 12/27/2014 08:36 PM, Erik B Beall wrote:
Ah, I see. Done, and compiles fine. Thanks Ibrahim!
Same here; compiles fine at that point but in my case there's a problem with execution on my omv3 board (STM32F429VIT6). After flashing and power cycle, the device doesn't show up on lsusb and the LED isn't blinking. Without a debugger I have no idea what's going on. :/  Your hardware working, Erik?

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Erik B Beall

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Jan 3, 2015, 12:17:47 AM1/3/15
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Yeah, its working fine, but its the regular 407-based OpenMV1 I built. I'm building an OpenMV2 tomorrow morning and will let you know how it goes. 

Erik B Beall

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Jan 3, 2015, 11:30:32 PM1/3/15
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I'm able to get the STM32 bootloader visible when I short BOOT to VCC, and loaded the code built for OpenMV2 (with the changes mentioned in this thread), but when rebooting, I don't get a USB device. The lights go into __fatal_error() when plugging in, so omv/main.c is executing (I can change the LED flash sequence, reflash, and observe the change). Tomorrow I'll do some debugging using the LED sequence to figure out which call to __fatal_error() it is.

Steve Gulick

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Jan 24, 2015, 7:54:03 PM1/24/15
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I'm also having trouble with the FLASH_ISR overflow by 92 bytes.
Can someone post a working stm32f4xx.ld.S file? I have been trying to modify it but without luck
Thanks!

Erik B Beall

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Jan 25, 2015, 10:17:21 AM1/25/15
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Remove lines 90 and 91:
    */ff.o(.text*)
    */ccsbcs.o(.text*)
And you should be able to fit it. The code will just go in the non-ISR regions, Ibrahim did this to save space as best as possible.

Steve Gulick

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Jan 25, 2015, 6:02:55 PM1/25/15
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Thanks, Erik - that worked fine!
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