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arm: mach-imx: Makefile: Extend u-boot-nand.imx padding

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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/

Signed-off-by: Hiago De Franco <hiago.franco@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
This commit is contained in:
Hiago De Franco 2023-10-03 18:26:54 -03:00 committed by Stefano Babic
parent 0c39564d02
commit 7dede4033b
1 changed files with 3 additions and 1 deletions
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4
arch/arm/mach-imx/Makefile
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@ -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)