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board/ci20: create a SD card image
Add a genimage.cfg to create a working sdcard.img for the ci20 hardware. We also need a uboot-env.txt to create the partition for the uboot environment. Update the board/ci20/readme.txt with the related information. Remove the tftp netboot description from the readme as it is already to complicated for a basic bootable example. Signed-off-by: Johannes Schmitz <johannes.schmitz1@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Johannes Schmitz
Thomas Petazzoni
parent
735158d55a
commit
523688ae5c
29
board/ci20/genimage.cfg
Normal file
29
board/ci20/genimage.cfg
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@ -0,0 +1,29 @@
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image sdcard.img {
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hdimage {
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}
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partition uboot-spl {
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in-partition-table = "no"
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image = "u-boot-spl.bin"
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offset = 512
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}
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partition uboot {
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in-partition-table = "no"
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image = "u-boot.img"
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offset = 14k
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}
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partition uboot-env {
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in-partition-table = "no"
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image = "uboot-env.bin"
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offset = 526k
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}
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partition rootfs {
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partition-type = 0x83
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image = "rootfs.ext4"
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offset = 2M
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size = 60M
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}
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}
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@ -2,41 +2,45 @@
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* MIPS Creator CI20 *
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*********************
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Introduction
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============
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The 'ci20_defconfig' will create a root filesystem and a kernel image
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under the 'output/images/' directory. This document will try to explain how
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to use them in order to run Buildroot in the MIPS Creator CI20 board.
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Assuming you are at the U-Boot prompt of the MIPS Creator CI20, you have to
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load the generated kernel image by using the 'tftpboot' command. In
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order to do that, you will need to get the network working. Here you
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have the instructions to set the ip address, netmask and gateway:
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How to build it
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===============
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setenv ipaddr x.x.x.x
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setenv netmask x.x.x.x
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setenv gatewayip x.x.x.x
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Configure Buildroot
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-------------------
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Now you have to set the ip for the TFTP server you are going to load the
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kernel image from, and also the name of the kernel image file (we use
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'uImage' as a filename in this example):
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$ make ci20_defconfig
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setenv serverip x.x.x.x
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setenv bootfile uImage
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Build the rootfs
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----------------
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And finally load the kernel image:
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Note: you will need to have access to the network, since Buildroot will
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download the packages' sources.
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tftpboot
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You may now build your rootfs with:
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Now you have to extract the generated root filesystem into a USB drive
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or SD-Card. Here you have the instructions to boot from the two of them.
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You have to choose the one your prefer:
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$ make
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From USB
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setenv bootargs console=ttyS4,115200 console=tty0 mem=256M@0x0
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mem=768M@0x30000000 root=/dev/sda1
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(This may take a while, consider getting yourself a coffee ;-) )
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From SD-Card
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setenv bootargs console=ttyS4,115200 console=tty0 mem=256M@0x0
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mem=768M@0x30000000 root=/dev/mmcblk0p1
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How to write the SD card
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========================
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And finally run this command to boot the board:
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bootm
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Once the build process is finished you will have an image called
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"sdcard.img" in the output/images/ directory.
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Make sure the SD card is not mounted then copy the bootable "sdcard.img" onto
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it with "dd":
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$ sudo dd if=output/images/sdcard.img of=/dev/sdX
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Insert the SDcard into your ci20, and power it up. Your new system
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should come up now and start a console on the UART HEADER.
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see: https://elinux.org/CI20_Hardware#Dedicated_UART_header
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10
board/ci20/uboot-env.txt
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10
board/ci20/uboot-env.txt
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baudrate=115200
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board_mfr=NP
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bootargs=console=ttyS4,115200 console=tty0 mem=256M@0x0 mem=768M@0x30000000 rootwait root=/dev/mmcblk0p1 devtmpfs.mount=1 ip=dhcp
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bootcmd=run ethargs; ext4load mmc 0:1 0x88000000 /boot/uImage; bootm 0x88000000
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bootdelay=1
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ethargs=env set bootargs ${bootargs}
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loads_echo=1
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stderr=eserial0,eserial4
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stdin=eserial0,eserial4
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stdout=eserial0,eserial4
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@ -8,6 +8,10 @@ BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_18=y
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# system
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BR2_TARGET_GENERIC_GETTY_PORT="ttyS4"
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BR2_TARGET_ROOTFS_EXT2=y
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BR2_TARGET_ROOTFS_EXT2_4=y
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BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
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BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/ci20/genimage.cfg"
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# kernel
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BR2_LINUX_KERNEL=y
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@ -15,6 +19,7 @@ BR2_LINUX_KERNEL_CUSTOM_GIT=y
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BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/MIPS/CI20_linux.git"
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BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="7dff33297116643485ca37141d804eddd793e834"
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BR2_LINUX_KERNEL_DEFCONFIG="ci20"
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BR2_LINUX_KERNEL_INSTALL_TARGET=y
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# u-boot
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BR2_TARGET_UBOOT=y
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@ -26,3 +31,9 @@ BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="dd3c1b95dac7d10b2ca5806f65e5c1050d7dd0fa"
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BR2_TARGET_UBOOT_FORMAT_IMG=y
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BR2_TARGET_UBOOT_SPL=y
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BR2_TARGET_UBOOT_SPL_NAME="spl/u-boot-spl.bin"
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BR2_TARGET_UBOOT_ENVIMAGE=y
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BR2_TARGET_UBOOT_ENVIMAGE_SOURCE="board/ci20/uboot-env.txt"
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BR2_TARGET_UBOOT_ENVIMAGE_SIZE="32768"
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# host
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BR2_PACKAGE_HOST_GENIMAGE=y
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