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stm32mp: correctly handle board_get_usable_ram_top(0)

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The function board_get_usable_ram_top can be called after relocation
with total_size = 0 to get the uppermost pointer that is valid to access
in U-Boot.

When total_size = 0, the reserved memory should be not take in account
with lmb library and 'gd->ram_base + gd->ram_size' can be used.

It is the case today in lib/efi_loader/efi_memory.c:efi_add_known_memory()
and this patch avoids that the reserved memory for OP-TEE is not part of
the EFI available memory regions.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Patrick Delaunay 2021-07-26 11:55:27 +02:00 committed by Patrice Chotard
parent f64d32a27a
commit 92b611e8b0
1 changed files with 3 additions and 0 deletions
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3
arch/arm/mach-stm32mp/dram_init.c
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@ -46,6 +46,9 @@ ulong board_get_usable_ram_top(ulong total_size)
phys_addr_t reg;
struct lmb lmb;
if (!total_size)
return gd->ram_base + gd->ram_size;
/* found enough not-reserved memory to relocated U-Boot */
lmb_init(&lmb);
lmb_add(&lmb, gd->ram_base, gd->ram_size);