Re: [PATCH v1 4/9] stm32mp: dram_init: Limit DDR usage under 4GB boundary for STM32MP

Hi,

On 10/27/23 16:42, Patrice Chotard wrote:

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

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),

Reviewed-by: Patrick Delaunay patrick.delaunay@foss.st.com

Thanks Patrick