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stm32mp: dram_init: Limit DDR usage under 4GB boundary for STM32MP

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Limit DDR usage under 4GB boundary on STM32MP regardless of
memory size declared in device tree.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Patrice Chotard
2023-11-13 10:55:38 +01:00
parent ee15c72da2
commit 75ba0fd570
1 changed files with 7 additions and 1 deletions
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arch/arm/mach-stm32mp/dram_init.c
+7 -1
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@@ -52,9 +52,15 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
if (!total_size)
return gd->ram_top;
/*
* make sure U-Boot uses address space below 4GB boundaries even
* if the effective available memory is bigger
*/
gd->ram_top = clamp_val(gd->ram_top, 0, SZ_4G - 1);
/* found enough not-reserved memory to relocated U-Boot */
lmb_init(&lmb);
lmb_add(&lmb, gd->ram_base, get_effective_memsize());
lmb_add(&lmb, gd->ram_base, gd->ram_top - gd->ram_base);
boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob);
/* add 8M for reserved memory for display, fdt, gd,... */
size = ALIGN(SZ_8M + CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE),