losetup: support building rootfs images with 4096 byte sector sizes
- Dec 11, 2018
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Zhuowei Zhang authored
Adds an optional deviceinfo variable, `deviceinfo_rootfs_image_sector_size`, which specifies the logical sector size of the device's storage. Some devices made after 2016 with UFS storage uses 4096 byte sectors instead of the normal 512 bytes. The partition table in our rootfs must match, otherwise the root filesystem won't mount on the device. This change passes the sector size to `losetup` when creating the image if the deviceinfo specifies it, so the image will have the correct sector size. If the deviceinfo doesn't specify the new option, the behaviour is the same as previous versions of pmbootstrap. Note that the sector size option only works on Linux 4.14 and above, so pmbootstrap should be run on a >4.14 computer when installing to devices with non-standard sector size. To find if a device needs this parameter, run `fdisk -l` on the device. If the output shows `Note: sector size is 4096 (not 512)` then add `deviceinfo_rootfs_image_sector_size="4096"` to the deviceinfo. This is needed by the Pixel 3 XL (google-crosshatch) port. See https://gitlab.com/postmarketOS/pmbootstrap/issues/1696.
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