[PATCH v3 6/7] stm32mp: Increase the reserved memory in board_get_usable_ram_top

[Patrick Delaunay]

Add 8M for the U-Boot reserved memory (display, fdt, gd, ...).

Without this patch the device tree, located before the MALLOC area
is not tagged cacheable just after relocation, before mmu reconfiguration.

This patch reduces the duration for device tree parsing in
lmb_init_and_reserve.

Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
---

Changes in v3:
- NEW: solve performance issue as relocated DT is not marked cacheable

 arch/arm/mach-stm32mp/dram_init.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-stm32mp/dram_init.c b/arch/arm/mach-stm32mp/dram_init.c
index 66e81bacca..9fb3ade82e 100644
--- a/arch/arm/mach-stm32mp/dram_init.c
+++ b/arch/arm/mach-stm32mp/dram_init.c
@@ -50,7 +50,8 @@ ulong board_get_usable_ram_top(ulong total_size)
 	lmb_init(&lmb);
 	lmb_add(&lmb, gd->ram_base, gd->ram_size);
 	boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob);
-	size = ALIGN(CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE),
+	/* add 8M for reserved memory for display, fdt, gd,... */
+	size = ALIGN(SZ_8M + CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE),
 	reg = lmb_alloc(&lmb, size, MMU_SECTION_SIZE);
 
 	if (!reg)
-- 
2.17.1