[Tinkerphones] LetuxOS: PinePhone support

[Xavi Drudis Ferran]

El Mon, Feb 03, 2020 at 07:24:22PM +0100, H. Nikolaus Schaller deia:
> Hi,
> finally, after bootstrapping my aarch64-linux-gnu (arm64) cross-toolchain
> and fixing minor issues I am able to compile our kernel tree for
> arm64 :)
> 
> Using a pinephone_defconfig from
> 
> 	https://gitlab.com/pine64-org/linux/blob/58a9a99b775d71c5b78f19da1a251788561d28cc/arch/arm64/configs/pinephone_defconfig
> 
> and letux-5.5.1 I got an 248 MB vmimage.
> 
> Next I have to find out which image compression is needed for the
> U-Boot and how to place it on the SD card and then try to boot.
>

I don't know about Allwinner, but what I remember about Pine Rockpro64
is that arm64 kernels can't decompress themselves. So uboot does that
after loading and before booting.

You can cp Image.gz to the card and in bootcmd decompress it with the uboot command:

unzip $compressedKernImgAdr $uncompressedKernImgAdr

My notes are somethign like

export CROSS_COMPILE=aarch64-linux-gnu- ; export ARCH=arm64
make clean
make ${something}_defconfig

make -j 12 BL31=bl31.elf  u-boot-dtb.bin spl/u-boot-spl.bin u-boot.itb
./tools/mkimage -n rk3399 -T rksd -d tpl/u-boot-tpl-dtb.bin out #this will be different for allwinner, I guess


cp u-boot-rockchip/uEnv.txt /media/.../boot/
cp linux-5.2.11/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtb /media/.../boot/rk3399-rockpro64.dtb
cp linux-5.2.11/arch/arm64/boot/Image.gz /media/.../boot/Image.gz

in uEnv.txt:

KERNCOMPADDR=0x13000000
KERNUNCADDR=0x10000000
DEVTREEADDR=0x14000000
bootargs=...
bootcmd=ext4load mmc 1:1 $KERNCOMPADDR Image.gz; unzip $KERNCOMPADDR $KERNUNCADDR; ext4load mmc 1:1 $DEVTREEADDR rk3399-rockpro64.dtb; booti $KERNUNCADDR - $DEVTREEADDR