[PATCH] arm: bootm: Disable LMB reservation for command line and board info on arm64

Marek Vasut marek.vasut at gmail.com
Sat May 29 13:34:32 CEST 2021

On arm64, board info is not applicable and kernel command line patched into
the DT, so the LMB reservation here makes no sense anymore. On legacy arm32,
this might still be necessary on systems which do not use DT or use legacy
ATAGS. Disable this LMB reservation on arm64.

This also permits Linux DT to specify reserved memory node at address close
to the end of DRAM bank, i.e. overlaping with U-Boot location. Since after
boot, U-Boot will be no more, this is OK.

Signed-off-by: Marek Vasut <marek.vasut+renesas at gmail.com>
Cc: Hai Pham <hai.pham.ud at renesas.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
Cc: Stephen Warren <swarren at nvidia.com>
Cc: Tom Rini <trini at konsulko.com>
 arch/arm/lib/bootm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index f60ee3a7e6..23b99a541c 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -43,6 +43,7 @@ DECLARE_GLOBAL_DATA_PTR;
 static struct tag *params;
+#ifndef CONFIG_ARM64
 static ulong get_sp(void)
 	ulong ret;
@@ -86,6 +87,7 @@ void arch_lmb_reserve(struct lmb *lmb)
 __weak void board_quiesce_devices(void)

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