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genio: u-boot: patch: mt8195: adjust memory size at runtime and fixup fdt

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- Use TFA + libdram to obtain and set the actual memory size.
- Overwrite the memory size in the devicetree that is passed to the kernel with the actual size detected.
- All credit to Bartosz Bilas' work for the mt8188/mt8370.
- This doesn't really "use" TF-A/libdram though, those call bl33 with magic arguments which we read here.
- That is implemented by a patch in TF-A for the mt8195 platform.
This commit is contained in:
Ricardo Pardini 2026-01-04 16:11:01 +01:00 committed by Igor
parent 5911f02880
commit a03b88841c
1 changed files with 125 additions and 0 deletions
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125
patch/u-boot/u-boot-genio/3300-GENIO-arch-mediatek-1200-evk-radxa-nio-12l-adjust-memory-size-at-runtime-and-fixup-fdt.patch Normal file
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@ -0,0 +1,125 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Ricardo Pardini <ricardo@pardini.net>
Date: Sat, 3 Jan 2026 23:11:34 +0100
Subject: GENIO: arch: mediatek: 1200-evk/radxa-nio-12l: adjust memory size at
runtime and fixup fdt
Use TFA + libdram to obtain and set the actual memory size.
Overwrite the memory size in the devicetree that is passed to the kernel with the actual size detected.
All credit to Bartosz Bilas' work for the mt8188/mt8370.
This doesn't really "use" TF-A/libdram though, those call bl33 with magic arguments which we read here.
That is implemented by a patch in TF-A for the mt8195 platform.
Signed-off-by: Ricardo Pardini <ricardo@pardini.net>
---
arch/arm/mach-mediatek/mt8195/init.c | 17 +++++++---
board/mediatek/genio-1200-evk/mt8195_evk.c | 9 +++++
configs/genio_1200_radxa_nio_12l_d16_defconfig | 3 +-
configs/genio_1200_radxa_nio_12l_d4_defconfig | 3 +-
configs/genio_1200_radxa_nio_12l_d8_defconfig | 3 +-
include/configs/mt8195.h | 3 ++
6 files changed, 31 insertions(+), 7 deletions(-)
diff --git a/arch/arm/mach-mediatek/mt8195/init.c b/arch/arm/mach-mediatek/mt8195/init.c
index 111111111111..222222222222 100644
--- a/arch/arm/mach-mediatek/mt8195/init.c
+++ b/arch/arm/mach-mediatek/mt8195/init.c
@@ -22,11 +22,20 @@ int dram_init(void)
{
int ret;
- ret = fdtdec_setup_memory_banksize();
- if (ret)
- return ret;
+ if (BOOT_ARGUMENT->magic_number == BOOT_ARGUMENT_MAGIC) {
+ gd->ram_base = CONFIG_SYS_SDRAM_BASE;
+ gd->ram_size = BOOT_ARGUMENT->dram_size;
+ debug("Boot argument DRAM size: %lluGB\n", gd->ram_size >> 30);
+ } else {
+ debug("Did NOT get magic number from BOOT_ARGUMENT, use FDT to get DRAM size\n");
+ ret = fdtdec_setup_mem_size_base();
+ if (ret)
+ return ret;
+ }
- fdtdec_setup_mem_size_base();
+ mem_map[0].size = gd->ram_size;
+ mem_map[0].phys = gd->ram_base;
+ mem_map[0].virt = gd->ram_base;
/*
* Limit gd->ram_top not exceeding SZ_4G.
diff --git a/board/mediatek/genio-1200-evk/mt8195_evk.c b/board/mediatek/genio-1200-evk/mt8195_evk.c
index 111111111111..222222222222 100644
--- a/board/mediatek/genio-1200-evk/mt8195_evk.c
+++ b/board/mediatek/genio-1200-evk/mt8195_evk.c
@@ -229,3 +229,12 @@ int board_init(void)
return 0;
}
+
+int ft_board_setup(void *blob, struct bd_info *bd)
+{
+ /*
+ * Overwrite the memory size in the devicetree that is
+ * passed to the kernel with the actual size detected.
+ */
+ return fdt_fixup_memory(blob, gd->ram_base, gd->ram_size);
+}
diff --git a/configs/genio_1200_radxa_nio_12l_d16_defconfig b/configs/genio_1200_radxa_nio_12l_d16_defconfig
index 111111111111..222222222222 100644
--- a/configs/genio_1200_radxa_nio_12l_d16_defconfig
+++ b/configs/genio_1200_radxa_nio_12l_d16_defconfig
@@ -21,7 +21,8 @@ CONFIG_DISTRO_DEFAULTS=y
CONFIG_FIT=y
CONFIG_FIT_SIGNATURE=y
CONFIG_LEGACY_IMAGE_FORMAT=y
-# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
+CONFIG_OF_CONTROL=y
+CONFIG_OF_BOARD_SETUP=y
CONFIG_DEFAULT_FDT_FILE="mediatek/mt8395-radxa-nio-12l"
# CONFIG_DISPLAY_BOARDINFO is not set
# CONFIG_CMD_CONSOLE is not set
diff --git a/configs/genio_1200_radxa_nio_12l_d4_defconfig b/configs/genio_1200_radxa_nio_12l_d4_defconfig
index 111111111111..222222222222 100644
--- a/configs/genio_1200_radxa_nio_12l_d4_defconfig
+++ b/configs/genio_1200_radxa_nio_12l_d4_defconfig
@@ -21,7 +21,8 @@ CONFIG_DISTRO_DEFAULTS=y
CONFIG_FIT=y
CONFIG_FIT_SIGNATURE=y
CONFIG_LEGACY_IMAGE_FORMAT=y
-# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
+CONFIG_OF_CONTROL=y
+CONFIG_OF_BOARD_SETUP=y
CONFIG_DEFAULT_FDT_FILE="mediatek/mt8395-radxa-nio-12l"
# CONFIG_DISPLAY_BOARDINFO is not set
# CONFIG_CMD_CONSOLE is not set
diff --git a/configs/genio_1200_radxa_nio_12l_d8_defconfig b/configs/genio_1200_radxa_nio_12l_d8_defconfig
index 111111111111..222222222222 100644
--- a/configs/genio_1200_radxa_nio_12l_d8_defconfig
+++ b/configs/genio_1200_radxa_nio_12l_d8_defconfig
@@ -21,7 +21,8 @@ CONFIG_DISTRO_DEFAULTS=y
CONFIG_FIT=y
CONFIG_FIT_SIGNATURE=y
CONFIG_LEGACY_IMAGE_FORMAT=y
-# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
+CONFIG_OF_CONTROL=y
+CONFIG_OF_BOARD_SETUP=y
CONFIG_DEFAULT_FDT_FILE="mediatek/mt8395-radxa-nio-12l"
# CONFIG_DISPLAY_BOARDINFO is not set
# CONFIG_CMD_CONSOLE is not set
diff --git a/include/configs/mt8195.h b/include/configs/mt8195.h
index 111111111111..222222222222 100644
--- a/include/configs/mt8195.h
+++ b/include/configs/mt8195.h
@@ -162,4 +162,7 @@
#define MTK_SIP_PLAT_BINFO 0xC2000529
#endif
+/* DRAM */
+#define CONFIG_SYS_SDRAM_BASE 0x40000000 // I got this from the DeviceTree "reg = <0 0x40000000 4 0x00000000>;"
+
#endif
--
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