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Fix U-Boot config to access all RAM on 16 GB CM5 (#4045)

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* Fix U-Boot config to access all RAM on 16 GB CM5

U-Boot defconfig used for Yellow checks only 4 DRAM banks, however, CM5 with 16
GB has the memory spread across 8 banks. Add a patch (submitted upstream) to
the defconfig to get access to the whole RAM.

Fixes #3989

* Add Upstream tag with link to uboot patchwork
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Jan Čermák 2025-05-01 22:53:47 +02:00 committed by GitHub
parent 257a96b39a
commit 6ec77b845d
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1 changed files with 34 additions and 0 deletions
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buildroot-external/board/raspberrypi/patches/uboot/0013-configs-rpi-set-NR_DRAM_BANKS-to-8-to-accommodate-RA.patch Normal file
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@ -0,0 +1,34 @@
From 2525238175cb77f2cc0d83d77cc527997160bd90 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20=C4=8Cerm=C3=A1k?= <sairon@sairon.cz>
Date: Wed, 30 Apr 2025 18:33:53 +0200
Subject: [PATCH] configs: rpi: set NR_DRAM_BANKS to 8 to accommodate RAM on
16GB models
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Raspberry Pi 5 can now have up to 16 GiB of RAM where the memory spans 8
DRAM banks in total. Increase the config value to 8 to initialize the
whole RAM. Without this change, kernel only sees 8 GiB of RAM on the 16
GiB CM5 as reported in [1].
[1] https://github.com/home-assistant/operating-system/issues/3989
Signed-off-by: Jan Čermák <sairon@sairon.cz>
Upstream: https://patchwork.ozlabs.org/project/uboot/patch/20250430171555.144243-1-sairon@sairon.cz/
---
configs/rpi_arm64_defconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/configs/rpi_arm64_defconfig b/configs/rpi_arm64_defconfig
index 9fe5d177943..69e8e72c5d7 100644
--- a/configs/rpi_arm64_defconfig
+++ b/configs/rpi_arm64_defconfig
@@ -2,6 +2,7 @@ CONFIG_ARM=y
CONFIG_POSITION_INDEPENDENT=y
CONFIG_ARCH_BCM283X=y
CONFIG_TARGET_RPI_ARM64=y
+CONFIG_NR_DRAM_BANKS=8
CONFIG_ENV_SIZE=0x4000
CONFIG_DEFAULT_DEVICE_TREE="bcm2711-rpi-4-b"
CONFIG_OF_LIBFDT_OVERLAY=y