Custom kernel compilation

Setting the u-boot and ftpboot

The u-boot is configured to download a freshly new compiled kernel on a server and boot it. So the server must be setup with dnsmasq to provide dhcp and tftpboot.

Here is the configuration file for dnsmasq.conf:

enable-tftp

tftp-root=<path-to-your-build-dir>

dhcp-boot=vmlinux

interface=eth0

As the board does not embbed a network card, I use an USB-ethernet adapter based on ASIX which is largely supported and very cheap (note I bought a bunch of these adapters and *one* apple adapter very expensive, this one is dead while the others cheap manufactured adapters work like a charm). Keywords for aliexpress "Asix AX8872B", "USB", "2.0', "RJ45".

So to make it simple, here is the printenv:

• red : added commands
• blue : renamed commands
• black : defauts commands

rock960 => printenv

arch=arm

baudrate=1500000

board=rock960_rk3399

board_name=rock960_rk3399

boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}

boot_dhcp=usb start; dhcp rockchip/vmlinuz; bootm 0x800800

boot_efi_binary=if fdt addr ${fdt_addr_r}; then bootefi bootmgr ${fdt_addr_r};else bootefi bootmgr ${fdtcontroladdr};fi;load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} efi/boot/bootaa64.efi; if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi

boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}extlinux/extlinux.conf

boot_net_usb_start=usb start

boot_prefixes=/ /boot/

boot_script_dhcp=boot.scr.uimg

boot_scripts=boot.scr.uimg boot.scr

boot_targets=mmc0 mmc1 usb0 pxe dhcp 

bootcmd=run boot_dhcp

bootcmd_bak=run distro_bootcmd

bootcmd_dhcp=run boot_net_usb_start; if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci PXEClient:Arch:00011:UNDI:003000;setenv bootp_arch 0xb;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv efi_old_vci;

bootcmd_mmc0=setenv devnum 0; run mmc_boot

bootcmd_mmc1=setenv devnum 1; run mmc_boot

bootcmd_pxe=run boot_net_usb_start; dhcp; if pxe get; then pxe boot; fi

bootcmd_usb0=setenv devnum 0; run usb_boot

bootdelay=2

cpu=armv8

distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done

efi_dtb_prefixes=/ /dtb/ /dtb/current/

fdt_addr_r=0x01f00000

fdtcontroladdr=f5f34f68

fdtfile=rockchip/rk3399-rock960.dtb

kernel_addr_r=0x02080000

load_efi_dtb=load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}${efi_fdtfile}

mmc_boot=if mmc dev ${devnum}; then setenv devtype mmc; run scan_dev_for_boot_part; fi

partitions=uuid_disk=${uuid_gpt_disk};name=loader1,start=32K,size=4000K,uuid=${uuid_gpt_loader1};name=loader2,start=8MB,size=4MB,uuid=${uuid_gpt_loader2};name=trust,size=4M,uuid=${uuid_gpt_atf};name=boot,size=112M,bootable,uuid=${uuid_gpt_boot};name=rootfs,size=-,uuid=B921B045-1DF0-41C3-AF44-4C6F280D3FAE;

pxefile_addr_r=0x00600000

ramdisk_addr_r=0x04000000

scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done;run scan_dev_for_efi;

scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then run scan_dev_for_boot; fi; done

scan_dev_for_efi=setenv efi_fdtfile ${fdtfile}; for prefix in ${efi_dtb_prefixes}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run load_efi_dtb; fi;done;if test -e ${devtype} ${devnum}:${distro_bootpart} efi/boot/bootaa64.efi; then echo Found EFI removable media binary efi/boot/bootaa64.efi; run boot_efi_binary; echo EFI LOAD FAILED: continuing...; fi; setenv efi_fdtfile

scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}extlinux/extlinux.conf; then echo Found ${prefix}extlinux/extlinux.conf; run boot_extlinux; echo SCRIPT FAILED: continuing...; fi

scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done

scriptaddr=0x00500000

serverip=192.168.0.46

soc=rockchip

stderr=serial@ff1a0000

stdin=serial@ff1a0000

stdout=serial@ff1a0000

usb_boot=usb start; if usb dev ${devnum}; then setenv devtype usb; run scan_dev_for_boot_part; fi

vendor=vamrs

Environment size: 4032/32764 bytes