In case U-Boot runs in EL3, which is the highest privilege level on ARM64, there can be no firmware running that would restrict access to the bottom 128 MiB of DRAM. In fact, it is likely that U-Boot would have to load that firmware into those bottom 128 MiB of DRAM and start that firmware.
Make those bottom 128 MiB of DRAM available in case U-Boot runs in EL3 to allow loading the firmware to that area.
Signed-off-by: Marek Vasut marek.vasut+renesas@mailbox.org --- Cc: Adam Ford aford173@gmail.com Cc: Biju Das biju.das.jz@bp.renesas.com Cc: Hai Pham hai.pham.ud@renesas.com Cc: Lad Prabhakar prabhakar.mahadev-lad.rj@bp.renesas.com Cc: Nobuhiro Iwamatsu iwamatsu@nigauri.org Cc: Paul Barker paul.barker.ct@bp.renesas.com Cc: Simon Glass sjg@chromium.org Cc: Tom Rini trini@konsulko.com Cc: u-boot@lists.denx.de --- V2: Make this non-Gen4 specific, Gen3 an benefit from this too --- board/renesas/rcar-common/common.c | 32 +++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-)
diff --git a/board/renesas/rcar-common/common.c b/board/renesas/rcar-common/common.c index 4e35e0151c9..90eb468e4c4 100644 --- a/board/renesas/rcar-common/common.c +++ b/board/renesas/rcar-common/common.c @@ -15,6 +15,7 @@ #include <asm/io.h> #include <dm/uclass-internal.h> #include <asm/arch/renesas.h> +#include <asm/system.h> #include <linux/libfdt.h>
#ifdef CONFIG_RCAR_64 @@ -23,13 +24,42 @@ DECLARE_GLOBAL_DATA_PTR;
int dram_init(void) { - return fdtdec_setup_mem_size_base(); + int ret = fdtdec_setup_mem_size_base(); + + if (current_el() == 3 && gd->ram_base == 0x48000000) { + /* + * If this U-Boot runs in EL3, make the bottom 128 MiB + * available for loading of follow up firmware blobs. + */ + gd->ram_base -= 0x8000000; + gd->ram_size += 0x8000000; + } + + return ret; }
int dram_init_banksize(void) { + int bank; + fdtdec_setup_memory_banksize();
+ if (current_el() != 3) + return 0; + + for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) { + if (gd->bd->bi_dram[bank].start != 0x48000000) + continue; + + /* + * If this U-Boot runs in EL3, make the bottom 128 MiB + * available for loading of follow up firmware blobs. + */ + gd->bd->bi_dram[bank].start -= 0x8000000; + gd->bd->bi_dram[bank].size += 0x8000000; + break; + } + return 0; }