initial buildroot for linux 5.15

board/ci20/genimage.cfg

@@ -0,0 +1,28 @@
+image sdcard.img {
+	hdimage {
+	}
+
+	partition uboot-spl {
+		in-partition-table = "no"
+		image = "u-boot-spl.bin"
+		offset = 512
+	}
+
+	partition uboot {
+		in-partition-table = "no"
+		image = "u-boot.img"
+		offset = 14K
+	}
+
+	partition uboot-env {
+		in-partition-table = "no"
+		image = "uboot-env.bin"
+		offset = 526K
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+		offset = 2M
+	}
+}

board/ci20/patches/uboot/0001-mips-Remove-default-endiannes.patch

@@ -0,0 +1,66 @@
+From b3a1e97498e7987073775d49a703932c20f2df1d Mon Sep 17 00:00:00 2001
+From: Ezequiel Garcia <ezequiel@collabora.com>
+Date: Mon, 12 Nov 2018 14:04:46 -0300
+Subject: [PATCH] mips: Remove default endiannes
+
+Currently, trying to build ci20_mmc fails on little-endian
+toolchains. The problem seems to be that some targets don't
+have CONFIG_SYS_LITTLE_ENDIAN properly set, and therefore
+the default -EB switch is selected.
+
+Let's get rid of the default switch entirely, and fix this problem.
+While this may be a hack, it is a quick solution until
+U-Boot gets CI20 proper support.
+
+make ARCH=mips CROSS_COMPILE=mips-linux-gnu- ci20_mmc
+Configuring for ci20_mmc - Board: ci20, Options: SPL_MMC_SUPPORT,ENV_IS_IN_MMC
+make
+make[1]: Entering directory '/home/zeta/repos/u-boot-ci20'
+Generating include/autoconf.mk
+Generating include/autoconf.mk.dep
+mips-linux-gnu-gcc: error: may not use both -EB and -EL
+mips-linux-gnu-gcc: error: may not use both -EB and -EL
+Generating include/spl-autoconf.mk
+mips-linux-gnu-gcc: error: may not use both -EB and -EL
+Generating include/tpl-autoconf.mk
+mips-linux-gnu-gcc: error: may not use both -EB and -EL
+mips-linux-gnu-gcc -DDO_DEPS_ONLY \
+	-g  -Os   -ffunction-sections -fdata-sections -D__KERNEL__ -I/home/zeta/repos/u-boot-ci20/include -fno-builtin -ffreestanding -nostdinc -isystem /home/zeta/repos/buildroot/mips/output/host/opt/ext-toolchain/bin/../lib/gcc/mips-linux-gnu/5.3.0/include -pipe  -DCONFIG_MIPS -D__MIPS__ -G 0 -EB -msoft-float -fpic -mabicalls -march=mips32 -mabi=32 -DCONFIG_32BIT -mno-branch-likely -Wall -Wstrict-prototypes       \
+	-o lib/asm-offsets.s lib/asm-offsets.c -c -S
+if [ -f arch/mips/cpu/xburst/jz4780/asm-offsets.c ];then \
+	mips-linux-gnu-gcc -DDO_DEPS_ONLY \
+	-g  -Os   -ffunction-sections -fdata-sections -D__KERNEL__ -I/home/zeta/repos/u-boot-ci20/include -fno-builtin -ffreestanding -nostdinc -isystem /home/zeta/repos/buildroot/mips/output/host/opt/ext-toolchain/bin/../lib/gcc/mips-linux-gnu/5.3.0/include -pipe  -DCONFIG_MIPS -D__MIPS__ -G 0 -EB -msoft-float -fpic -mabicalls -march=mips32 -mabi=32 -DCONFIG_32BIT -mno-branch-likely -Wall -Wstrict-prototypes       \
+		-o arch/mips/cpu/xburst/jz4780/asm-offsets.s arch/mips/cpu/xburst/jz4780/asm-offsets.c -c -S; \
+else \
+	touch arch/mips/cpu/xburst/jz4780/asm-offsets.s; \
+fi
+mips-linux-gnu-gcc: error: may not use both -EB and -EL
+make[1]: *** [Makefile:747: lib/asm-offsets.s] Error 1
+make[1]: *** Waiting for unfinished jobs....
+make[1]: Leaving directory '/home/zeta/repos/u-boot-ci20'
+make: *** [.boards.depend:463: ci20_mmc] Error 2
+
+Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
+---
+https://github.com/MIPS/CI20_u-boot/pull/19
+
+ arch/mips/config.mk | 3 ---
+ 1 file changed, 3 deletions(-)
+
+diff --git a/arch/mips/config.mk b/arch/mips/config.mk
+index c89279025507..43560abbc0e1 100644
+--- a/arch/mips/config.mk
++++ b/arch/mips/config.mk
+@@ -20,9 +20,6 @@ ifdef CONFIG_SYS_BIG_ENDIAN
+ ENDIANNESS := -EB
+ endif
+ 
+-# Default to EB if no endianess is configured
+-ENDIANNESS ?= -EB
+-
+ PLATFORM_CPPFLAGS += -DCONFIG_MIPS -D__MIPS__
+ 
+ #
+-- 
+2.19.1
+

board/ci20/readme.txt

@@ -0,0 +1,46 @@
+*********************
+* MIPS Creator CI20 *
+*********************
+
+Introduction
+============
+
+The 'ci20_defconfig' will create a root filesystem and a kernel image
+under the 'output/images/' directory. This document will try to explain how
+to use them in order to run Buildroot in the MIPS Creator CI20 board.
+
+How to build it
+===============
+
+Configure Buildroot
+-------------------
+
+  $ make ci20_defconfig
+
+Build the rootfs
+----------------
+
+Note: you will need to have access to the network, since Buildroot will
+download the packages' sources.
+
+You may now build your rootfs with:
+
+  $ make
+
+(This may take a while, consider getting yourself a coffee ;-) )
+
+How to write the SD card
+========================
+
+Once the build process is finished you will have an image called
+"sdcard.img" in the output/images/ directory.
+
+Make sure the SD card is not mounted then copy the bootable "sdcard.img" onto
+it with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX
+
+Insert the SDcard into your ci20, and power it up. Your new system
+should come up now and start a console on the UART HEADER.
+
+see: https://elinux.org/CI20_Hardware#Dedicated_UART_header

board/ci20/uboot-env.txt

@@ -0,0 +1,10 @@
+baudrate=115200
+board_mfr=NP
+bootargs=console=ttyS4,115200 console=tty0 mem=256M@0x0 mem=768M@0x30000000 rootwait root=/dev/mmcblk0p1 devtmpfs.mount=1 ip=dhcp
+bootcmd=run ethargs; ext4load mmc 0:1 0x88000000 /boot/uImage; bootm 0x88000000
+bootdelay=1
+ethargs=env set bootargs ${bootargs}
+loads_echo=1
+stderr=eserial0,eserial4
+stdin=eserial0,eserial4
+stdout=eserial0,eserial4