Without this patch, the devicetree used by linux at runtime is
the u_boot devicetree.
While using rusticl on the khadas vim3 board with the default
extlinux.conf, mesa's panfrost driver return "gpu shed timeout"
errors. Adding "devicetree /meson-g12b-khadas-vim3.dtb" to the
extlinux.conf file solve the problem. Linux successfully boot
with and without the change but without this patch the devicetree
used by linux at runtime is the u-boot devicetree.
The differences between the u-boot devicetree and the linux
devicetree are:
-The u-boot devicetree contains two more nodes than the linux devicetree. Those nodes are:
- smbios : compatible option is set to "u-boot,sysinfo-smbios".
- __symbols__ : present if -@ or --symbols is used during the devicetree compilation.
-Most of u-boot devicetree nodes have a "phandle" property.
-SoC and vpu have a "u-boot,dm-pre-reloc;" property.
-Some aliases are different.
-The u-boot operating points tables contains more nodes.
The size difference between the u-boot devicetree and the linux
devicetree is approximately 3.5kB.
During runtime, the linux devicetree have the "phandle" and
"u-boot,dm-pre-reloc;" properties and the smbios node. So,
The runtime devicetree is the one from u-boot.
Signed-off-by: Antoine Coutant <antoine.coutant@smile.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Add defconfig for the Khadas VIM3 board which uses a A311D SoC with a 4x
ARM Cortex-A73 + 2x ARM Cortex-A53 big.LITTLE architecture.
This defconfig includes the Linux mainline kernel version 6.3 as well as
mainline uboot version 2023.04 with an in-tree .dts and uboot-defconfig.
It also includes the host-tool amlogic-boot-fip which is necessary for
signing the bootloader. This host tool is used in the post-image.sh script
in order to generate the signed binary.
This binary is then flashed to the final sdcard.img after it is
generated using genimage. It is done in this way because the bootloader
image needs to be flashed in 2 steps. First the first 444 bytes need to
be flashed to the beginning of the sdcard.img, then we need to skip 68 bytes
in the source and the destination and then write the remaining
bootloader image to the sdcard.img.
Ref: http://docs.khadas.com/products/sbc/vim3/development/create-bootable-tf-card
Signed-off-by: Sebastian Weyer <sebastian.weyer@smile.fr>
[Romain:
add BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_3=y
add BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
add BR2_PACKAGE_HOST_DOSFSTOOLS=y for genimage vfat support
]
Signed-off-by: Romain Naour <romain.naour@smile.fr>
