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image: fix Linksys image alignment and simplify footer creation

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Current factory image sizes for Linksys devices are 256-byte aligned. This
is not an issue writing factory images from the OpenWrt or Linksys GUIs,
but can lead to failures using a TFTP client from the Linksys bootloader:

     NAND write: device 1 offset 0x2800000, size 0xc00100
     Attempt to write to non page aligned data
     NAND write to offset 2800000 failed -22
      0 bytes written: ERROR

Simplify Linksys footer creation by migrating to a makefile build recipe,
and pre-pad the footer (with 0xFF) to ensure the final image is $(PAGESIZE)
aligned.  Finally, remove the old linksys-image.sh script no longer needed.

Linksys footer details are given below for future reference. The 256-byte
footer is appended to factory images and tested by both the Linksys
Upgrader (observed in EA6350v3) and OpenWrt sysupgrade.

  Footer format:
    .LINKSYS.     Checked by Linksys upgrader before continuing.  (9 bytes)
    <VERSION>     Upgrade version number, unchecked so arbitrary. (8 bytes)
    <TYPE>        Model of device, space padded (0x20).          (15 bytes)
    <CRC>         CRC checksum of factory image to flash.         (8 bytes)
    <padding>     Padding ('0' + 0x20 * 7)                        (8 bytes)
    <signature>   Signature of signer, unchecked so arbitrary.   (16 bytes)
    <padding>     Padding with nulls (0x00)                     (192 bytes)

Link: https://github.com/openwrt/openwrt/pull/11405#issuecomment-1358510123
Link: https://github.com/openwrt/openwrt/pull/11405#issuecomment-1587517739

Reported-by: Stijn Segers <foss@volatilesystems.org>
Reported-by: Wyatt Martin <wawowl@gmail.com>
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
This commit is contained in:
Tony Ambardar
2023-11-13 17:14:07 -08:00
committed by Hauke Mehrtens
parent b16e14a220
commit cd5e0134b6
2 changed files with 10 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
include/image-commands.mk
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@@ -389,10 +389,17 @@ define Build/kernel-bin
endef
define Build/linksys-image
$(TOPDIR)/scripts/linksys-image.sh \
let \
size="$$(stat -c%s $@)" \
pad="$(call exp_units,$(PAGESIZE))" \
offset="256" \
pad="(pad - ((size + offset) % pad)) % pad"; \
dd if=/dev/zero bs=$$pad count=1 | tr '\000' '\377' >> $@
printf ".LINKSYS.01000409%-15s%08X%-8s%-16s" \
"$(call param_get_default,type,$(1),$(DEVICE_NAME))" \
$@ $@.new
mv $@.new $@
"$$(cksum $@ | cut -d ' ' -f1)" \
"0" "K0000000F0246434" >> $@
dd if=/dev/zero bs=192 count=1 >> $@
endef
define Build/lzma