sdimage-raspberrypi.wks: increase /boot minimal size from 20 to 100

[shr-project]

• current aarch64 kernel image alone is 24MB: 24M tmp-glibc/deploy/images/raspberrypi4-64/Image-raspberrypi4-64-1-6.1.77+git0+43d1723dbe_77fc1fbcb5-r0.1-20110405230000.bin and with rpi-bootfiles it takes around 46MB (e.g. this is from kirkstone raspberrypi4-64 build):

  2.0K    boot.scr
  2.0K    cmdline.txt
  4.0K    fixup4cd.dat
  4.0K    fixup_cd.dat
  4.0K    uEnv.txt
  6.0K    fixup4.dat
  8.0K    fixup.dat
  10K     fixup4db.dat
  10K     fixup4x.dat
  10K     fixup_db.dat
  10K     fixup_x.dat
  16K     uboot.env
  36K     config.txt
  52K     bcm2711-rpi-4-b.dtb
  52K     bcm2711-rpi-400.dtb
  52K     bcm2711-rpi-cm4.dtb
  52K     bootcode.bin
  126K    overlays
  558K    kernel8.img
  786K    start4cd.elf
  786K    start_cd.elf
  2.2M    start4.elf
  2.9M    start.elf
  2.9M    start4x.elf
  3.6M    start4db.elf
  3.6M    start_x.elf
  4.6M    start_db.elf
  23M     Image

• it is increased automatically to fit the content:

  tmp-glibc/deploy/images/raspberrypi4-64 $ sfdisk -l core-image-minimal-raspberrypi4-64.rootfs--1.0-r0-20110405230000.wic Disk core-image-minimal-raspberrypi4-64.rootfs--1.0-r0-20110405230000.wic: 241.2 MiB, 252915712 bytes, 493976 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x076c4a2a
  
  Device                                                                Boot  Start    End Sectors   Size Id Type
  core-image-minimal-raspberrypi4-64.rootfs--1.0-r0-20110405230000.wic1 *      8192 157815  149624  73.1M  c W95 FAT32 (LBA)
  core-image-minimal-raspberrypi4-64.rootfs--1.0-r0-20110405230000.wic2      163840 493975  330136 161.2M 83 Linux

  but if you want to update the kernel in place or add some additional files later, it might not be big enough, increase the minimal size from 20M to 100M

• reminder (as I forgot about it before): "--size" is just minimum

  https://docs.yoctoproject.org/ref-manual/kickstart.html says:

--size: The minimum partition size. Specify as an integer value optionally followed by one of the units “k” / “K” for kibibyte, “M” for mebibyte and “G” for gibibyte. The default unit if none is given is “M”. You do not need this option if you use --source. --fixed-size: The exact partition size. Specify as an integer value optionally followed by one of the units “k” / “K” for kibibyte, “M” for mebibyte and “G” for gibibyte. The default unit if none is given is “M”. Cannot be specify together with --size. An error occurs when assembling the disk image if the partition data is larger than --fixed-size.