5911f02880
- With this, bl2 will pass down the DRAM size it gets from libdram down to bl33 (u-boot proper) via a magic location - This is a rework of the implementation for another MTK plat (GRINN)
112 lines
3.6 KiB
Diff
112 lines
3.6 KiB
Diff
From 6ea06df6886453c312c0a7094f46372cb9803106 Mon Sep 17 00:00:00 2001
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From: Ricardo Pardini <ricardo@pardini.net>
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Date: Sun, 4 Jan 2026 01:56:47 +0100
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Subject: [PATCH] plat: mediatek: mt8195: use libdram to pass actual memory
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size to U-Boot
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Since libdram can obtain the actual memory size at runtime, make it possible
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to pass this value to U-Boot. This allows the bootloader to adapt to boards
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with different DRAM sizes without requiring manual configuration.
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All credit to Bartosz Bilas' work for the mt8188.
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Signed-off-by: Ricardo Pardini <ricardo@pardini.net>
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---
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plat/mediatek/mt8195/bl2_plat_setup.c | 5 +++++
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plat/mediatek/mt8195/drivers/libdram/libdram.h | 14 ++++++++++++++
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plat/mediatek/mt8195/drivers/libdram/rules.mk | 12 ++++++++++++
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plat/mediatek/mt8195/include/platform_def.h | 2 ++
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plat/mediatek/mt8195/platform.mk | 1 +
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5 files changed, 34 insertions(+)
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create mode 100644 plat/mediatek/mt8195/drivers/libdram/libdram.h
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create mode 100644 plat/mediatek/mt8195/drivers/libdram/rules.mk
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diff --git a/plat/mediatek/mt8195/bl2_plat_setup.c b/plat/mediatek/mt8195/bl2_plat_setup.c
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index 85e524827..ea157d885 100644
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--- a/plat/mediatek/mt8195/bl2_plat_setup.c
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+++ b/plat/mediatek/mt8195/bl2_plat_setup.c
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@@ -33,6 +33,7 @@
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#if defined(PLAT_AB_BOOT_ENABLE)
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#include <mtk_ab.h>
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#endif
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+#include "libdram.h"
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void pwrap_init(void);
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void mt_mem_init(void);
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@@ -429,6 +430,10 @@ void bl2_platform_setup(void)
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load_partition_table(GPT_IMAGE_ID);
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blkdev_set_dramk_data_offset(get_part_addr("dramk"));
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mt_mem_init();
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+
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+ BOOT_ARGUMENT->magic_number = BOOT_ARGUMENT_MAGIC;
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+ BOOT_ARGUMENT->dram_size = platform_memory_size();
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+
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/* change storage read buffer to DRAM */
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boot_dev_spec->buffer.offset = 0x41000000;
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boot_dev_spec->buffer.length = 0x1000000;
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diff --git a/plat/mediatek/mt8195/drivers/libdram/libdram.h b/plat/mediatek/mt8195/drivers/libdram/libdram.h
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new file mode 100644
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index 000000000..311d3a25c
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--- /dev/null
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+++ b/plat/mediatek/mt8195/drivers/libdram/libdram.h
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@@ -0,0 +1,14 @@
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+/*
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+ * Copyright (c) 2025 Grinn sp. z o.o
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+ *
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+ * SPDX-License-Identifier: BSD-3-Clause
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+ */
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+
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+#ifndef LIBDRAM_H
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+#define LIBDRAM_H
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+
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+#include <stdint.h>
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+
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+unsigned long long platform_memory_size(void);
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+
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+#endif /* LIBDRAM_H */
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diff --git a/plat/mediatek/mt8195/drivers/libdram/rules.mk b/plat/mediatek/mt8195/drivers/libdram/rules.mk
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new file mode 100644
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index 000000000..38f23c3dd
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--- /dev/null
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+++ b/plat/mediatek/mt8195/drivers/libdram/rules.mk
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@@ -0,0 +1,12 @@
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+#
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+# Copyright (c) 2025, Grinn sp. z o.o. All rights reserved.
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+#
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+# SPDX-License-Identifier: BSD-3-Clause
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+#
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+
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+LOCAL_DIR := $(call GET_LOCAL_DIR)
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+
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+MODULE := libdram
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+
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+PLAT_INCLUDES += -I${LOCAL_DIR}/
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+$(eval $(call MAKE_MODULE,$(MODULE),$(LOCAL_SRCS-y),$(MTK_BL)))
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diff --git a/plat/mediatek/mt8195/include/platform_def.h b/plat/mediatek/mt8195/include/platform_def.h
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index 187fd1eac..95e45a4d0 100644
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--- a/plat/mediatek/mt8195/include/platform_def.h
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+++ b/plat/mediatek/mt8195/include/platform_def.h
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@@ -202,6 +202,8 @@
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#define BL2_BASE (0x201000)
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#define BL2_LIMIT (0x400000)
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+#define BOOT_ARGUMENT_LOCATION (0x40000100) // Gotta match u-boot's arch/arm/include/asm/arch-mediatek/misc.h
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+
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#define MAX_IO_DEVICES U(3)
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#define MAX_IO_HANDLES U(4)
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#define MAX_IO_BLOCK_DEVICES 1
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diff --git a/plat/mediatek/mt8195/platform.mk b/plat/mediatek/mt8195/platform.mk
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index f62b8551d..f860ffd34 100644
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--- a/plat/mediatek/mt8195/platform.mk
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+++ b/plat/mediatek/mt8195/platform.mk
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@@ -103,6 +103,7 @@ endif
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endif
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MODULES-BL2-y += ${MTK_PLAT}/common/drivers/blkdev
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+MODULES-BL2-y += $(MTK_PLAT_SOC)/drivers/libdram
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$(eval $(call add_define,PLAT_PARTITION_BLOCK_SIZE))
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--
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2.52.0
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