[ECOS] Re: redboot on STM32f4-discovery board

[John Dallaway <john@dallaway.org.uk>]

Hi Oleg

On 09/10/14 16:48, Oleg Uzenkov wrote:

> I have tried to run redboot on a custom board (very similar to
> STM32f4-discovery board, so let's say that we have discovery in question).

[ snip ]

> I just would like to get redboot working on a board without external RAM.
> 
> These are my findings so far:
> 
> 1. I built redboot for ROM startup (applied relevant adjustings from
> stm3240g_eval's  redboot_rom.ecm)
> 
> 2. flashed the board with redboot at 0x08000000
> 
> 3.
> when CYGOPT_REDBOOT_FIS == 0 redboot loads, but is very unstable, can
> stop working any time... But, without Flash Image System I do not see
> how to use redboot to load and store and run images.
> 
> when CYGOPT_REDBOOT_FIS == 1  redboot hangs.  It happens when
> do_flash_init() runs (problem in memcpy , probably illigal memory access)
> 
> A question, can actually redboot work without external ram?
> 
> If yes, how to fit it properly? (the board has stm32f407VE with 128+64
> KB of internal ram, 512KB internal flash)

Consider the output of RedBoot on STM3240G-EVAL (from your earlier message):

> RedBoot(tm) bootstrap and debug environment [ROM]
> ...
> Platform: ST STM3240G-EVAL (Cortex-M4)
> RAM: 0x64000000-0x64200000 [0x64005d30-0x641dd000 available]
>      0x20000000-0x2001f000 [0x20000000-0x2001f000 available]
>      0x10000000-0x10010000 [0x10000000-0x10010000 available]
> FLASH: 0x08000000-0x080fffff, 4 x 0x4000 blocks, 1 x 0x10000 blocks, 7 x 0x20000 blocks
> RedBoot> 

This shows that RedBoot is using 0x5d30 bytes of external RAM with FIS
enabled. If you have ported RedBoot to your custom board correctly, I
would expect it to report internal RAM usage similar, but not identical,
to the following:

> RAM: 0x20000000-0x2001f000 [0x20005d30-0x2001f000 available]

Is that what you are observing?

So RedBoot should fit it available RAM quite easily.

I would concentrate on tracking down the reliability issue when RedBoot
is configured without the FIS first. Once you have a stable RedBoot
without the FIS, you can then try enabling the FIS.

I hope this helps....

John Dallaway
eCos maintainer
http://www.dallaway.org.uk/john


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