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| author | Tony Ambardar <itugrok@yahoo.com> | 2023-11-11 04:46:14 -0800 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2023-11-26 18:37:20 +0100 |
| commit | fc16df9fdd596d1a3f5c3be897dc0cf69c84c469 (patch) | |
| tree | 58345a15e8f516b44c0baf2fa46ba641693e4bb9 /include/image-commands.mk | |
| parent | cd5e0134b6bd2e34ad237d985da99c5307816c93 (diff) | |
| download | openwrt-fc16df9fdd596d1a3f5c3be897dc0cf69c84c469.tar.gz openwrt-fc16df9fdd596d1a3f5c3be897dc0cf69c84c469.tar.bz2 openwrt-fc16df9fdd596d1a3f5c3be897dc0cf69c84c469.zip | |
image: improve UBI image sizing on NAND devices
Many NAND devices use a build recipe with "append-ubi | check-size" to
ensure factory images don't exceed the target flash partition size.
However, UBI reserves space for bad block handling and other operational
overhead, and thus 'check-size' can overestimate the space available by
several MB. In practice, this means a failed check is definitely a failure,
while a passing check is only probably a pass.
Improve the situation by teaching 'Build/append-ubi' to check image sizes
while accounting for UBI reserved blocks. Add new device variable NAND_SIZE
and use with existing IMAGE_SIZE to derate the available space. Each UBI
device reserves 20 PEBs per 1024 PEBs of the entire NAND device for bad
blocks, plus an additional 4 PEBs overhead.
Many devices can transparently enable this check by setting NAND_SIZE based
on their flash storage, and may then remove any unneeded 'check-size'.
Link: http://www.linux-mtd.infradead.org/doc/ubi.html#L_overhead
Suggested-by: Shiji Yang <yangshiji66@qq.com>
Suggested-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
Diffstat (limited to 'include/image-commands.mk')
| -rw-r--r-- | include/image-commands.mk | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/image-commands.mk b/include/image-commands.mk index 7d9f93fed7..41a5e1198a 100644 --- a/include/image-commands.mk +++ b/include/image-commands.mk @@ -133,6 +133,8 @@ define Build/append-md5sum-ascii-salted rm $@.salted endef +UBI_NAND_SIZE_LIMIT = $(IMAGE_SIZE) - ($(NAND_SIZE)*20/1024 + 4*$(BLOCKSIZE)) + define Build/append-ubi sh $(TOPDIR)/scripts/ubinize-image.sh \ $(if $(UBOOTENV_IN_UBI),--uboot-env) \ @@ -146,6 +148,8 @@ define Build/append-ubi $(UBINIZE_OPTS) cat $@.tmp >> $@ rm $@.tmp + $(if $(and $(IMAGE_SIZE),$(NAND_SIZE)),\ + $(call Build/check-size,$(UBI_NAND_SIZE_LIMIT))) endef define Build/ubinize-kernel |