[PATCH] arm/stm32h7: Add support for STM32H750B-DK

[Karel Gardas]

On 7/11/23 15:50, Kinsey Moore wrote:
> This adds support for the STM32H750B-DK discovery kit. This kit includes
> a built-in STLINKv3 debugger which provides a USB serial bridge for
> USART3. USART1 is routed to the Arduino header and USART2 is routed to
> the STMOD connector. This BSP reuses what would otherwise be duplicated
> files from the stm32h747i-disco BSP. Note that system_stm32h7xx.c has
> been imported from the STM repository with two minor changes wrapped
> with #if __rtems__. This hardware has been tested with hello and ticker.

Nice! So with a just little bit of tweak I may get my stm32h745-disco 
up&running as your 750 is on the same disco kit. Sweet! :-)

> diff --git a/spec/build/bsps/arm/stm32h7/optmemsdram1sz.yml b/spec/build/bsps/arm/stm32h7/optmemsdram1sz.yml
> index bd1053db38..56ec66a64f 100644
> --- a/spec/build/bsps/arm/stm32h7/optmemsdram1sz.yml
> +++ b/spec/build/bsps/arm/stm32h7/optmemsdram1sz.yml
> @@ -14,6 +14,9 @@ default:
>     - arm/stm32h757i-eval-m4
>     - arm/stm32h7b3i-dk
>     value: 0x00000000
> +- enabled-by:
> +  - arm/stm32h750b-dk
> +  value: 0x01000000
>   - enabled-by: true
>     value: 0x02000000
>   description: |

Have you actually tested writing to the SDRAM 1 memory region? Asking 
since IIRC several of STMicro data sheets were wrong about specifying 
RAM to be SDRAM 1 while in fact it was in SDRAM 2 region by default. And 
your system*.c does not contain (if I've not overlooked it) any 
remapping from SDRAM 2 to SDRAM 1 -- so just asking for to be sure, you 
actually tested putting some data into it.

E.g. "An 8M x 32-bit SDRAM is connected to the SDRAM bank1 of the FMC 
interface of the STM32H7x7XI microcontroller." -- this comes from um2525 
for stm32h757i-eval and no, by default SDRAM is mapped to bank2.

Thanks,
Karel