[PATCH] Basic lwIP for STM32H7 BSP

[Robin Müller]

How would you define a generic linker section? I tried to put the following
section into the
linkcmdsmemory file like you suggested (at
spec/build/bsps/arm/stm32h7/linkcmdsmemory.yml):

  SECTIONS {
    .stm32h7_sram_3 (NOLOAD) : ALIGN_WITH_INPUT {
      bsp_stm32h7_sram_3_start = stm32h7_memory_sram_3_begin;
      bsp_stm32h7_sram_3_end = stm32h7_memory_sram_3_end;
    } > SRAM_3 AT > FLASH
  }

But the waf build fails with  a syntax error:

[1610/1611] Linking build/arm/stm32h7/testsuites/samples/ticker.exe
[1611/1611] Linking build/arm/stm32h7/testsuites/samples/unlimited.exe
c:/users/robin/rtems/rtems-tools/rtems/6/bin/../lib/gcc/arm-rtems6/10.2.1/../../../../arm-rtems6/bin/ld.exe:linkcmds.memory:84:
syntax error
collect2.exe: error: ld returned 1 exit status

c:/users/robin/rtems/rtems-tools/rtems/6/bin/../lib/gcc/arm-rtems6/10.2.1/../../../../arm-rtems6/bin/ld.exe:linkcmds.memory:84:
syntax error
collect2.exe: error: ld returned 1 exit status

Kind Regards
Robin

On Thu, 25 Mar 2021 at 13:15, Robin Müller <robin.mueller.m at gmail.com>
wrote:

> That is how it was done in the lwIP demo provided by STM, I simply adopted
> that. The SRAM3 is small, but big enough for lwIP, so all of it is used
> completely by lwIP.
> How would you place the descriptors in code so that these linker script
> sections are not necessary? You mentioned RTEMS_SECTIONs. Are those used in
> the source code?
>
> Kind Regards
> Robin Müller
>
> On Mon, 22 Mar 2021 at 11:43, Sebastian Huber <
> sebastian.huber at embedded-brains.de> wrote:
>
>> On 03/02/2021 14:50, Robin Müller wrote:
>>
>> > The following link contains more theoretical information about why
>> > these sections were placed at these addresses:
>> >
>> https://community.st.com/s/article/FAQ-DMA-is-not-working-on-STM32H7-devices
>> > <
>> https://community.st.com/s/article/FAQ-DMA-is-not-working-on-STM32H7-devices
>> >
>> >
>> > Kind Regards
>> > Robin
>> >
>> > On Wed, 3 Feb 2021 at 14:44, Robin Müller <robin.mueller.m at gmail.com
>> > <mailto:robin.mueller.m at gmail.com>> wrote:
>> >
>> >     The DMA descriptors need to be placed at the start of the SRAM3
>> >     and need to be aligned in a certain way. The RX buffer will take
>> >     up the first (slightly less than) 16 kB of SRAM3 but needs to be
>> >     placed
>> >     behind the DMA descriptors. It also needs to be placed in a way
>> >     that the MPU configuration required for the DMA descriptors will
>> >     not do something with the RX buffers.
>> >     In the example provided by STM32, the first 256 bytes are
>> >     configured by MPU Config.
>> >
>> I had a look at the FAQ and the manual. Currently, we use the SRAM1 for
>> the .nocache area. This is in the D2 domain. The Ethernet module is in
>> the D2 domain. I am not sure why you have to change this to the smaller
>> SRAM3? The libbsd driver works well with the current setting.
>>
>> --
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