Limit DDR usage under 4GB boundary on STM32MP regardless of
memory size declared in device tree.
Signed-off-by: Patrice Chotard <patrice.chot...@foss.st.com>
---
arch/arm/mach-stm32mp/dram_init.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-stm32mp/dram_init.c
b/arch/arm/mach-stm32mp/dram_init.c
index cb35ed60ca1..fb1208fc5d5 100644
--- a/arch/arm/mach-stm32mp/dram_init.c
+++ b/arch/arm/mach-stm32mp/dram_init.c
@@ -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),
--
2.25.1
