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syslinux: improve isohybrid to process extra sector count for ISO 9660 image

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Due to commit [cdrtools-native: fix booting EFI ISO live failed]
applied to improve mkisofs to fix nsectors exceeds 0xffff situation
which set selection criteria type = 2 and save extra nsectors to
vendor unique selection criteria

In following case, add 64MB extra space to bootable image efi.img,
and the partition table of EFI is truncated to 32M

$ echo 'IMAGE_FSTYPES:pn-core-image-minimal = " live"' >> conf/local.conf
$ echo 'MACHINE_FEATURES:append = " efi pcbios"' >> conf/local.conf
$ echo '# 64MB extra space to bootable image efi.img' >> conf/local.conf
$ echo 'BOOTIMG_EXTRA_SPACE = "65535"' >> conf/local.conf
$ bitbake core-image-minimal
$ fdisk -l tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs.iso
...
Device                                                                 Boot Start    End Sectors  Size Id Type
tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs.iso1 *        0 376831  376832  184M  0 Empty
tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs.iso2        120  65654   65535   32M ef EFI (FAT-12/16/32)

After applying this patch to process extra sector count, the partition
table of EFI is 90.3M

$ fdisk -l tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs.iso
...
Device                                                                 Boot Start    End Sectors  Size Id Type
tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs.iso1 *        0 376831  376832  184M  0 Empty
tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs.iso2        120 185151  185032 90.3M ef EFI (FAT-12/16/32)

[1]https://pdos.csail.mit.edu/6.828/2017/readings/boot-cdrom.pdf

(From OE-Core rev: b4e112ed7e6ba5a6c6df530d696485a588831851)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Hongxu Jia
2025-04-26 16:03:52 +08:00
committed by Richard Purdie
parent 7ff5ecce28
commit 161ff4d39d
2 changed files with 105 additions and 0 deletions
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meta/recipes-devtools/syslinux/syslinux_6.04-pre2.bb
+1
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@@ -23,6 +23,7 @@ SRC_URI = "https://www.zytor.com/pub/syslinux/Testing/6.04/syslinux-${PV}.tar.xz
file://0013-remove-clean-script.patch \
file://0014-Fix-reproducibility-issues.patch \
file://0001-ext2_fs.h-do-not-carry-an-outdated-copy.patch \
file://0001-Add-extra-sector-count-from-section-entry-for-EFI-ca.patch \
"
SRC_URI[md5sum] = "2b31c78f087f99179feb357da312d7ec"