Simon McVittie e6defffb23 Makefile: Optionally generate a bmaptool map file ...

bmaptool(1), from the bmap-tools package, can write the used blocks
in a sparse disk image to media, while saving time and I/O by not writing
zeroes to the unused blocks. Typical use:

    make raspi2_bullseye.img.bmap raspi2_bullseye.img.xz
    ... upload those two files ...
    ... download those two files ...
    bmaptool copy raspi2_bullseye.img.xz /dev/disk/by-id/usb-Generic-_SD_MMC_*-0:0

Signed-off-by: Simon McVittie <smcv@debian.org>

2021-04-25 11:22:59 +01:00

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