increase ESP partition for compatibility#129
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tsunghanliu wants to merge 1 commit intocanonical:classicfrom
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increase ESP partition for compatibility#129tsunghanliu wants to merge 1 commit intocanonical:classicfrom
tsunghanliu wants to merge 1 commit intocanonical:classicfrom
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To allow upgrades of gadget in older images, you could do:
min-size: 256M
size: 260M
This will specify a valid range of sizes for upgrades, but new images will use the size field.
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Thanks Alfonso! I've updated the commit.
When the ESP partition is 256MB and the disk is using 4K sector size, mkfs.fat will prompt: > WARNING: Number of clusters for 32 bit FAT is less than suggested minimum. Based on the implementation, the data area (i.e., **without** FAT32 header, reserved sectors and alignments/offset) should be larger than 65525 sectors. Therefore, 256MB is not enough for disks using 4K sector size. Use `truncate -s $((65696*4096)) part.bin; mkfs.fat -F 32 -S 4096 -v part.bin` to verify if the sector number is enough. By giving different FAT settings, the necessary size might by changed. For better compatibility and increasing 4MB doesn't consume a lot of disk space, it'd be good to have a bigger ESP partition. Reference: [1] mkfs.fat - https://github.com/dosfstools/dosfstools/blob/master/src/mkfs.fat.c [2] https://superuser.com/questions/1702331/what-is-the-minimum-size-of-a-4k-native-partition-when-formatted-with-fat32 Signed-off-by: Robert Liu <robert.liu@canonical.com>
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When the ESP partition is 256MB and the disk is using 4K sector size, mkfs.fat will prompt:
Based on the implementation, the data area (i.e., without FAT32 header, reserved sectors and alignments/offset) should be larger than 65525 sectors. Therefore, 256MB is not enough for disks using 4K sector size.
Use
truncate -s $((65696*4096)) part.bin; mkfs.fat -F 32 -S 4096 -v part.binto verify if the sector number is enough. By giving different FAT settings, the necessary size might by changed.For better compatibility and increasing 4MB doesn't consume a lot of disk space, it'd be good to have a bigger ESP partition.
Reference:
[1] mkfs.fat - https://github.com/dosfstools/dosfstools/blob/master/src/mkfs.fat.c
[2] https://superuser.com/questions/1702331/what-is-the-minimum-size-of-a-4k-native-partition-when-formatted-with-fat32