Using LwIP on the STM32H7
Robin Müller
robin.mueller.m at gmail.com
Thu Jan 28 15:45:28 UTC 2021
Thanks Sebastian.
The descriptors now appear to have addresses inside the RAM according to
the map file
*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.bsp_nocache*)))
.bsp_nocache 0x0000000030000000 0x18c0
CMakeFiles/fsfw_example.dir/bsp_stm32_rtems/boardconfig/ethernetif.c.obj
0x0000000030000000 DMARxDscrTab
0x0000000030000060 DMATxDscrTab
0x00000000300000c0 Rx_Buff
0x00000000300018c0 bsp_section_nocache_end =
.
0x00000000000018c0 bsp_section_nocache_size
= (bsp_section_nocache_end - bsp_section_nocache_begin)
But in the debugger, the descriptor entries are still zeroed out
unfortunately..
Kind Regards
Robin Müller
On Thu, 28 Jan 2021 at 16:39, Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:
> On 28/01/2021 14:35, Robin Müller wrote:
>
> > So far, transferring the code has worked, but there are some specific
> > sections in the code used for our FreeRTOS example which put the
> > ethernet DMA descriptors in specific sections:
> >
> > ETH_DMADescTypeDef DMARxDscrTab[ETH_RX_DESC_CNT]
> > __attribute__((section(".RxDecripSection"))); /* Ethernet Rx DMA
> > Descriptors */
> > ETH_DMADescTypeDef DMATxDscrTab[ETH_TX_DESC_CNT]
> > __attribute__((section(".TxDecripSection"))); /* Ethernet Tx DMA
> > Descriptors */
> > uint8_t Rx_Buff[ETH_RX_DESC_CNT][ETH_RX_BUFFER_SIZE]
> > __attribute__((section(".RxArraySection"))); /* Ethernet Receive
> > Buffers */
>
> The BSP has a nocache section, see
>
> bsps/arm/include/bsp/linker-symbols.h
>
> --
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