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docs/extra-build-config.md: document vars to add to boot partition

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FATPAYLOAD, DEPLOYPAYLOAD and RPI_SDIMG_EXTRA_DEPENDS

Signed-off-by: Christopher Clark <christopher.w.clark@gmail.com>
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Christopher Clark 2020-07-17 12:32:40 -07:00 committed by Andrei Gherzan
parent c883daa802
commit 11318d2da1
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docs/extra-build-config.md
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@ -172,6 +172,31 @@ To build an initramfs image:
- `INITRAMFS_MAXSIZE = "315400"`
- `IMAGE_FSTYPES_pn-${INITRAMFS_IMAGE} = "${INITRAMFS_FSTYPES}"`
## Including additional files in the SD card image boot partition
The SD card image class supports adding extra files into the boot
partition, where the files are copied from either the image root
partition or from the build image deploy directory.
To copy files that are present in the root partition into boot,
FATPAYLOAD is a simple space-separated list of files to be copied:
FATPAYLOAD = "/boot/example1 /boot/example2"
To copy files from the image deploy directory, the files should be
listed in the DEPLOYPAYLOAD as a space-separated list of entries.
Each entry lists a file to be copied, and an optional destination
filename can be specified by supplying it after a colon separator.
DEPLOYPAYLOAD = "example1-${MACHINE}:example1 example2"
Files that are to be included from the deploy directory will be produced
by tasks that image building task must depend upon, to ensure that the
files are available when they are needed, so these component deploy
tasks must be added to: RPI_SDIMG_EXTRA_DEPENDS.
RPI_SDIMG_EXTRA_DEPENDS_append = " example:do_deploy"
## Enable SPI bus
When using device tree kernels, set this variable to enable the SPI bus: