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WIP Enforce FAT32 Minimum Cluster Count #4139

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WIP Enforce FAT32 Minimum Cluster Count #4139

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Enforce a min of 256MB. 
Signed-off-by: Bruce Smith <bruce_smith_it@fastmail.com>
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@Smithx10
Smithx10 committed Jul 10, 2025
commit 905513ebb70e9845a6f82735889b0a03792ae71f
6 changes: 6 additions & 0 deletions tools/mkimage-raw-efi/make-efi
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Expand Up @@ -88,6 +88,12 @@ ESP_FILE_SIZE_KB=$(( ( ( ($ESP_DATA_SIZE + $FAT_OVERHEAD_SIZE + 1024 - 1) / 1024
# and for sectors
ESP_FILE_SIZE_SECTORS=$(( $ESP_FILE_SIZE_KB * 1024 / $SECTOR_SIZE ))

ESP_MIN_SIZE=$(( $SECTOR_SIZE * $SECTORS_PER_CLUSTER * $MIN_CLUSTERS ))
ESP_DATA_SIZE=$(( $KERNEL_FILE_SIZE + $INITRD_FILE_SIZE + $EFI_FILE_SIZE + $GRUB_FILE_SIZE ))
if [ "$ESP_DATA_SIZE" -lt "$ESP_MIN_SIZE" ]; then
ESP_DATA_SIZE="$ESP_MIN_SIZE"
fi

# create a raw disk with an EFI boot partition
# Stuff it into a FAT filesystem, making it as small as possible.
mkfs.vfat -v -F $FAT_SIZE -S $SECTOR_SIZE -s $SECTORS_PER_CLUSTER -R $RESERVED_SECTORS -C $ESP_FILE $(( $ESP_FILE_SIZE_KB )) > /dev/null
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