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Document the usage of bmap files

This commit is contained in:
Gunnar Wolf 2021-08-02 12:17:25 -05:00
parent 6cc7bc3666
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README.md
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@ -20,27 +20,25 @@ cd image-specs
```
For this you will first need to install the following packages on a
Debian Buster (10) or higher system:
Debian Bullseye (11) or higher system:
* vmdb2 (>= 0.17)
* dosfstools
* binfmt-support
* bmap-tools
* debootstrap
* dosfstools
* fakemachine (optional, only available on amd64)
* kpartx
* qemu-utils
* qemu-user-static
* debootstrap
* time
* kpartx
* fakemachine (optional, only available on amd64)
* vmdb2 (>= 0.17)
To install these (as root):
```shell
apt install -y vmdb2 dosfstools qemu-utils qemu-user-static debootstrap binfmt-support time kpartx
apt install -y vmdb2 dosfstools qemu-utils qemu-user-static debootstrap binfmt-support time kpartx bmap-tools
apt install -y fakemachine
```
Do note that –at least currently– vmdb2 uses some syntax that is available
only in the version in testing (Bullseye).
If debootstrap still fails with exec format error, try
running `dpkg-reconfigure qemu-user-static`. This calls
`/var/lib/dpkg/info/qemu-user-static.postinst` which uses binfmt-support
@ -65,7 +63,7 @@ or `bullseye` and <result-type\> is `img` or `yaml`.
Model `1` should be used for the Raspberry Pi 0, 0w and 1, models A and
B. Model `2` for the Raspberry Pi 2 models A and B. Model `3` for all
models of the Raspberry Pi 3 and model `4` for all models of the
Raspberry Pi 4.
Raspberry Pi 4.
So if you want to build the default image for a Raspberry Pi 3B+ with
Bullseye, you can just issue:
@ -110,7 +108,20 @@ important parts of your system. Double check it's the correct
device!), copy the image onto the SD card:
```shell
sudo dd if=raspi_3.img of=/dev/mmcblk0 bs=64k oflag=dsync status=progress
bmaptool copy raspi_3_bullseye.img.xz /dev/mmcblk0
```
Alternatively, if you don't have `bmap-tools` installed, you can use
`dd` with the compressed image:
```shell
xzcat raspi_3_bullseye.img | dd of=/dev/mmcblk0 bs=64k oflag=dsync status=progress
```
Or with the uncompressed image:
```shell
dd if=raspi_3_bullseye.img of=/dev/mmcblk0 bs=64k oflag=dsync status=progress
```
Then, plug the SD card into the Raspberry Pi, and power it up.