The Raspberry Pi 4 board can boot the image from USB memory.
But current meta-raspberrypi supports only SD boot.
This commit allows switching SD boot to other device.
For example, if you want to use USB boot, please define
the following parameters in your conf/local.conf file.
CMDLINE_ROOT_PARTITION = "/dev/sda2"
BOOT_MEDIA = "usb"
v4: Update extra-build-config.md to explain more detail for new variable.
v3: Changed variable name to "BOOT_MEDIA" (was "BOOT_DEVTIPE").
v2: Set existing microSD parameter as default. User can overwrite
some parameters.
Signed-off-by: Harunobu Kurokawa <harunobu.kurokawa.dn@renesas.com>
Modify boot.cmd.in from recipe rpi-u-boot-scr to create uboot.env
in the /boot partition when using U-Boot. This change is required
to successfully run fw_printenv from the user space.
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
For raspberrypi3-64 we need to use the Image or Image.gz format with u-boot
instead of the legacy uImage format. We also need to issue the 'booti' command
to boot the kernel instead of 'bootm'.
Signed-off-by: Paul Barker <pbarker@toganlabs.com>
A patch is backported to check if the firmware loaded a device tree blob
into memory and set the fdt_addr variable if it is found. The U-Boot
script will then read the command line arguments generated by the
firmware from the device tree and boot the kernel with the command
line arguments and the loaded device tree.
This allows things like MAC address, board revision and serial number
to be correctly configured and options in config.txt to be used.
An additional patch is backported and further changes are made to support
this.
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Paul Barker <paul@paulbarker.me.uk>
Upstream u-boot searches the boot partition for a script named 'boot.scr'. If
this file exists it is executed as a sequence of u-boot commands in order to
boot the system. This script must be compiled using the mkimage command to
ensure that it is understood by u-boot.
Signed-off-by: Paul Barker <paul@paulbarker.me.uk>
