[ECOS] Re: redboot on STM32f4-discovery board

"Ilija Kocho [Илија Кочо]" ilijak@siva.com.mk
Sat Oct 4 14:27:00 GMT 2014

On 03.10.2014 13:40, John Dallaway wrote:
> Hi Oleg
> On 02/10/14 09:47, Oleg Uzenkov wrote:
>> I am working with eCos on STM32f4-discovery board.
>> I would like to build a redboot loader that could choose and load
>> binaries (eCos+app) stored in internal flash at power on.
>> The eCos port for STM32f4-discovery has got a redboot option under
>> Packages list in Templates. However it seems to be very minimalistic and
>> also not functional. Also there is no specific configuration file like
>> redboot_ROM.ecm.
>> Please, could you give me directions as to making a functional redboot
>> loader for STM32f4-discovery board.
>> Would it make sense to build redboot for stm32x0g_eval board (redboot
>> seems to be working) and adapt it for STM32f4-discovery board?
>> I would appreciate any input on this.
> To be clear, there is no support for RedBoot in the STM32F4-Discovery
> platform HAL at present. The STM32F4-Discovery board offers only 128KiB
> of contiguous on-chip RAM, so loading applications into RAM prior to
> execution would limit the size of your applications quite considerably.
> RedBoot would also consume some of the available RAM for its own data
> structures.
> If you are still interested in using RedBoot to load and launch your
> applications, you will need to add the following to the
> STM32F4-Discovery platform HAL package:
> a) CDL items and memory layout files for RAM startup
> b) CDL items for behaving as a ROM monitor and for working with a ROM
>    monitor
> c) RedBoot-specific CDL items and data structures
> You will find examples of all the above in the STM32x0G_EVAL platform
> HAL package, but keep in mind that the STM32x0G_EVAL boards feature
> external RAM. The naming of memory regions and startup types is
> therefore different. The STM32x0G_EVAL "ROMINT" and "SRAM" startup types
> are broadly equivalent to the STM32F4-Discovery "ROM" and (proposed)
> "RAM" startup types respectively.

In addition, for example of RedBoot on a platform with only internal RAM
you can look at Kinetis.


> I hope this helps...
> John Dallaway
> eCos maintainer
> http://www.dallaway.org.uk/john

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