[Buildroot] [PATCH 2/2] board/ci20: Implement creation of a basic sdcard image for ci20
Johannes Schmitz
johannes.schmitz1 at gmail.com
Tue Jan 9 16:08:28 UTC 2018
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 at gmail.com>
---
board/ci20/genimage.cfg | 29 ++++++++++++++++++++++++++
board/ci20/readme.txt | 54 ++++++++++++++++++++++++++----------------------
board/ci20/uboot-env.txt | 10 +++++++++
configs/ci20_defconfig | 11 ++++++++++
4 files changed, 79 insertions(+), 25 deletions(-)
create mode 100644 board/ci20/genimage.cfg
create mode 100644 board/ci20/uboot-env.txt
diff --git a/board/ci20/genimage.cfg b/board/ci20/genimage.cfg
new file mode 100644
index 0000000..fa3e736
--- /dev/null
+++ b/board/ci20/genimage.cfg
@@ -0,0 +1,29 @@
+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
+ size = 60M
+ }
+}
diff --git a/board/ci20/readme.txt b/board/ci20/readme.txt
index ca7bb52..71d5070 100644
--- a/board/ci20/readme.txt
+++ b/board/ci20/readme.txt
@@ -2,41 +2,45 @@
* 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.
-Assuming you are at the U-Boot prompt of the MIPS Creator CI20, you have to
-load the generated kernel image by using the 'tftpboot' command. In
-order to do that, you will need to get the network working. Here you
-have the instructions to set the ip address, netmask and gateway:
+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.
- setenv ipaddr x.x.x.x
- setenv netmask x.x.x.x
- setenv gatewayip x.x.x.x
+You may now build your rootfs with:
-Now you have to set the ip for the TFTP server you are going to load the
-kernel image from, and also the name of the kernel image file (we use
-'uImage' as a filename in this example):
+ $ make
- setenv serverip x.x.x.x
- setenv bootfile uImage
+(This may take a while, consider getting yourself a coffee ;-) )
-And finally load the kernel image:
+How to write the SD card
+========================
- tftpboot
+Once the build process is finished you will have an image called
+"sdcard.img" in the output/images/ directory.
-Now you have to extract the generated root filesystem into a USB drive
-or SD-Card. Here you have the instructions to boot from the two of them.
-You have to choose the one your prefer:
+Make sure the SD card is not mounted then copy the bootable "sdcard.img" onto
+it with "dd":
-From USB
- setenv bootargs console=ttyS4,115200 console=tty0 mem=256M at 0x0
-mem=768M at 0x30000000 root=/dev/sda1
+ $ sudo dd if=output/images/sdcard.img of=/dev/sdX
-From SD-Card
- setenv bootargs console=ttyS4,115200 console=tty0 mem=256M at 0x0
-mem=768M at 0x30000000 root=/dev/mmcblk0p1
+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.
-And finally run this command to boot the board:
- bootm
+see: https://elinux.org/CI20_Hardware#Dedicated_UART_header
diff --git a/board/ci20/uboot-env.txt b/board/ci20/uboot-env.txt
new file mode 100644
index 0000000..3093496
--- /dev/null
+++ b/board/ci20/uboot-env.txt
@@ -0,0 +1,10 @@
+baudrate=115200
+board_mfr=NP
+bootargs=console=ttyS4,115200 console=tty0 mem=256M at 0x0 mem=768M at 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
diff --git a/configs/ci20_defconfig b/configs/ci20_defconfig
index 6de6394..f28dd4d 100644
--- a/configs/ci20_defconfig
+++ b/configs/ci20_defconfig
@@ -8,6 +8,10 @@ BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_18=y
# system
BR2_TARGET_GENERIC_GETTY_PORT="ttyS4"
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/ci20/genimage.cfg"
# kernel
BR2_LINUX_KERNEL=y
@@ -15,6 +19,7 @@ BR2_LINUX_KERNEL_CUSTOM_GIT=y
BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/MIPS/CI20_linux.git"
BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="7dff33297116643485ca37141d804eddd793e834"
BR2_LINUX_KERNEL_DEFCONFIG="ci20"
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
# u-boot
BR2_TARGET_UBOOT=y
@@ -26,3 +31,9 @@ BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="dd3c1b95dac7d10b2ca5806f65e5c1050d7dd0fa"
BR2_TARGET_UBOOT_FORMAT_IMG=y
BR2_TARGET_UBOOT_SPL=y
BR2_TARGET_UBOOT_SPL_NAME="spl/u-boot-spl.bin"
+BR2_TARGET_UBOOT_ENVIMAGE=y
+BR2_TARGET_UBOOT_ENVIMAGE_SOURCE="board/ci20/uboot-env.txt"
+BR2_TARGET_UBOOT_ENVIMAGE_SIZE="32768"
+
+# host
+BR2_PACKAGE_HOST_GENIMAGE=y
--
2.7.4
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