kumquat-buildroot/board/nezha/overlay/boot/extlinux/extlinux.conf

label linux
  kernel /boot/Image
  # use devicetree from u-boot
  append console=ttyS0,115200 root=/dev/mmcblk0p1 ro rootwait
configs/nezha_defconfig: new defconfig Add a defconfig for the Allwinner Nezha, a raspberrypi-style board built around the RISC-V 64bit D1 SoC. There is currently no upstream support, so use the git repos from Samuel Holland as explained on the linux-sunxi wiki: https://linux-sunxi.org/Allwinner_Nezha The U-Boot DTB is also used by opensbi, but the two branches are unfortunately not in sync at the moment, so add a patch to fix the compatible for the PLIC so opensbi makes it available to S-Mode (Linux). The use of the sun20i-d1-spl SPL bootloader / TOC1 file format also makes it a bit more complicated to build the boot image. As this is expected to only be a temporary issue, add a U-Boot patch to build the TOC1 image as part of the build rather than adding explicit support in our U-Boot package to do it. Signed-off-by: Peter Korsgaard <peter@korsgaard.com> 2021-11-06 18:29:55 +01:00			`label linux`
			`kernel /boot/Image`
nezha_defconfig: bump opensbi, u-boot and linux Opensbi is now based on 1.1, U-Boot on 2022.07-rc3 and Linux on 5.19-rc1. We don't yet support 5.19 kernel headers, so use 5.17 instead. The incompatibility between opensbi and u-boot is now fixed, so drop 0001-arch-riscv-dts-sun20i-d1.dtsi-adjust-plic-compatible.patch. The updated device tree in the kernel tree no longer specifies a memory node (and the board exists in 512M/1G/2G variants, so instead use the (otherwise identical) device tree provided by u-boot, where the memory node is fixed up based on the detected memory size. On riscv, the linux kernel unconditionally wants to build its bundled dtc, so it needs flex and bison, even if it is not going to build any DTB. We can get flex and bison either via the system ones, or we get them as they are in LINUX_KCONFIG_DEPENDENCIES. However, relying on this is a bit fragile, so we keep asking the kernel to build a DTB, so that we do ensure that our host-{flex,bison} are built and in the dependency chain of the kernel (for PPD). Signed-off-by: Peter Korsgaard <peter@korsgaard.com> [yann.morin.1998@free.fr: - extend on why we keep building a DTB from the kernel ] Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> 2022-09-06 18:15:56 +02:00			`# use devicetree from u-boot`
configs/nezha_defconfig: new defconfig Add a defconfig for the Allwinner Nezha, a raspberrypi-style board built around the RISC-V 64bit D1 SoC. There is currently no upstream support, so use the git repos from Samuel Holland as explained on the linux-sunxi wiki: https://linux-sunxi.org/Allwinner_Nezha The U-Boot DTB is also used by opensbi, but the two branches are unfortunately not in sync at the moment, so add a patch to fix the compatible for the PLIC so opensbi makes it available to S-Mode (Linux). The use of the sun20i-d1-spl SPL bootloader / TOC1 file format also makes it a bit more complicated to build the boot image. As this is expected to only be a temporary issue, add a U-Boot patch to build the TOC1 image as part of the build rather than adding explicit support in our U-Boot package to do it. Signed-off-by: Peter Korsgaard <peter@korsgaard.com> 2021-11-06 18:29:55 +01:00			`append console=ttyS0,115200 root=/dev/mmcblk0p1 ro rootwait`