[U-Boot] Issue with ALLOC_CACHE_ALIGN_BUFFER in env_relocate_spec and

[Vincent]

Hi,
I am having some issue with several instances of
ALLOC_CACHE_ALIGN_BUFFER in (at least):
- common/env_mmc: env_relocate_spec
- disk/part_dos: test_part_dos

U-boot (ls1021atwr) is build in SPL mode, SPL part is in Secure World,
u-boot is in Normal World.
In the SPL part, there is no problem, MMC access are fine. In the
normal world, I experience what I think is stack corruption:

At these locations, calls to the MMC to read partition info mostly
read 0 or garbages. Garbage looks like stack overflow/corruption. For
example, in the first function, checking the CRC of u-boot's env
stored in the MMC fails because the buffer is correct until the last
kb where there is values instead of zeroes, which looks like RAM
addresses and data.

I tried several fix, but I still don't understand what's happening:
- I tried to allocate the buffer where MMC data is read into the head
-> it works fine
- I tried to allocate more room to these buffer on the stack ->
sometimes it works, but not always.

Maybe it's my compiler (NXP's SDK 1.9, based on yocto) which is buggy,
I don't know.
I can provide some custom dump of memory if necessary, but the buffers
at these locations are quite huge I'm afraid.

Best regards,
Vincent