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sd-image: Updates comments

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This commit is contained in:
Samuel Dionne-Riel 2019-06-01 22:54:52 -04:00
parent 8634d5700d
commit 1843e00146
1 changed files with 13 additions and 4 deletions
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17
nixos/modules/installer/cd-dvd/sd-image.nix
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@ -1,8 +1,12 @@
# This module creates a bootable SD card image containing the given NixOS # This module creates a bootable SD card image containing the given NixOS
# configuration. The generated image is MBR partitioned, with a FAT /boot # configuration. The generated image is MBR partitioned, with a FAT
# partition, and ext4 root partition. The generated image is sized to fit # /boot/firmware partition, and ext4 root partition. The generated image
# its contents, and a boot script automatically resizes the root partition # is sized to fit its contents, and a boot script automatically resizes
# to fit the device on the first boot. # the root partition to fit the device on the first boot.
#
# The firmware partition is built with expectation to hold the Raspberry
# Pi firmware and bootloader, and be removed and replaced with a firmware
# build for the target SoC for other board families.
# #
# The derivation for the SD image will be placed in # The derivation for the SD image will be placed in
# config.system.build.sdImage # config.system.build.sdImage
@ -96,6 +100,9 @@ in
"/boot/firmware" = { "/boot/firmware" = {
device = "/dev/disk/by-label/FIRMWARE"; device = "/dev/disk/by-label/FIRMWARE";
fsType = "vfat"; fsType = "vfat";
# Alternatively, this could be removed from the configuration.
# The filesystem is not needed at runtime, it could be treated
# as an opaque blob instead of a discrete FAT32 filesystem.
options = [ "nofail" "noauto" ]; options = [ "nofail" "noauto" ];
}; };
"/" = { "/" = {
@ -125,6 +132,8 @@ in
truncate -s $imageSize $img truncate -s $imageSize $img
# type=b is 'W95 FAT32', type=83 is 'Linux'. # type=b is 'W95 FAT32', type=83 is 'Linux'.
# The "bootable" partition is where u-boot will look file for the bootloader
# information (dtbs, extlinux.conf file).
sfdisk $img <<EOF sfdisk $img <<EOF
label: dos label: dos
label-id: ${config.sdImage.firmwarePartitionID} label-id: ${config.sdImage.firmwarePartitionID}