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From 7dede4033bd0391d240914b3e54ec49a984d39b2 Mon Sep 17 00:00:00 2001
From: Hiago De Franco <hiago.franco@toradex.com>
Date: Tue, 3 Oct 2023 18:26:54 -0300
Subject: [PATCH] arm: mach-imx: Makefile: Extend u-boot-nand.imx padding
Extend the padding process of u-boot-nand.imx target by adding 10k bytes
of zeros to the end of the binary using the 'dd' command.
The existing padding method did not generate a functional binary,
as discussed in more detail in this thread [1]. Instead, we adopt the
end-padding calculation method documented in 'board/doc/colibri_imx7.rst'
as a reference, which is relevant for iMX7 with NAND storage.
Adding 10k bytes of zeros provides an approximate value that makes the
proper padding for these NAND devices.
[1] https://lore.kernel.org/all/CAC4tdFUqffQzRQFv5AGe_xtbFy1agr2SEpn_FzEdexhwjdryyw@mail.gmail.com/
Upstream-Status: Backport [7dede4033bd0391d240914b3e54ec49a984d39b2]
Signed-off-by: Hiago De Franco <hiago.franco@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
---
arch/arm/mach-imx/Makefile | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index aebfa6517b..6904cf3880 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -142,7 +142,9 @@ u-boot.imx: u-boot.bin u-boot.cfgout $(PLUGIN).bin FORCE
$(call if_changed,mkimage)
quiet_cmd_u-boot-nand_imx = GEN $@
-cmd_u-boot-nand_imx = (dd bs=1024 count=1 if=/dev/zero 2>/dev/null) | cat - $< > $@
+cmd_u-boot-nand_imx = (dd bs=1024 count=1 if=/dev/zero 2>/dev/null) | cat - $< > $@.zero-padded ; \
+ (dd bs=10k count=1 if=/dev/zero 2>/dev/null) | cat $@.zero-padded - > $@ ; \
+ rm -f $@.zero-padded
u-boot-nand.imx: u-boot.imx FORCE
$(call if_changed,u-boot-nand_imx)
--
2.42.0
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