On 19/06/2021 16:35, dufa...@hda.com wrote:
I'm getting back to this as I have the HyperRAM working so I'm trying to set up appropriate linker settings.On Jun 10, 2021, at 01:43 , Sebastian Huber<sebastian.hu...@embedded-brains.de> wrote: The initial stack needs to be in an accessible memory area. Currently it is placed in this linker output section: .rtemsstack (NOLOAD) : ALIGN_WITH_INPUT { bsp_section_rtemsstack_begin = .; *(SORT_BY_ALIGNMENT (SORT_BY_NAME (.rtemsstack*))) bsp_section_rtemsstack_end = .; } > REGION_WORK AT > REGION_WORK bsp_section_rtemsstack_size = bsp_section_rtemsstack_end - bsp_section_rtemsstack_begin; Maybe we should place the .rtemsstack.interrupt input section into the REGION_VECTOR memory region.On the "imxrt" REGION_VECTOR is in FLASH, at least ".vector' in the app I'm testing is at 0x6004653c which is in HyperFLASH.
Then place the .rtemsstack.interrupt input section into the REGION_STACK memory region and make sure REGIION_STACK is located in the OCRAM.
In HyperRAM I see these regions allocated: REGION_DATA: .rwbarrier REGION_DATA_LOAD: .data, .rtemsrwset REGION_BSS: .bss REGION_WORK: .rtemsstack, .work REGION_STACK: .stack So I put REGION_WORK in the OCRAM to get .rtemsstack out of HyperRAM to get started. My application is now running out of HyperFLASH and HyperRAM though I'm sure I'll find issues. - What's in "REGION_WORK"? Does that have anything to do with the RTEMS work space?
Yes, the RTEMS Workspace and C Program Heap use this region.
- What's the proper solution? I don't particularly want to redo my HyperRAM initialization to avoid using stack since I'm calling some NXP functions. I'd like a small amount of stack available in the context of bsp_start_hook_0() to set up the external RAM. - What's going on in the shared ARM _start with bsp_start_hook_0_done and the branch to bsp_start_hook_0()?
Some arm BSPs don't have a boot loader and relocate during startup from flash to RAM. See comment in start.S.
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