Linux on the i.MX6 sabre sd platform in a few commands-优快云博客

本文提供了一步一步的指南，教你如何在i.MX6 Sabresd平台上通过几个命令快速安装并启动Linux。首先，通过Git获取最新的Linux源代码。然后，使用交叉编译器进行编译。接着，创建一个适当的FAT分区在SD卡上，并将必要的文件（如uImage和dtb）复制到该分区。最后，将SD卡插入设备中并使用USB到串行端口连接进行引导，观察u-boot加载内核和dtb的过程。

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Linux on the i.MX6 sabre sd platform in a few commands

created by Vincent Stehle on Jun 21, 2013 9:56 AM, last modified by Vincent Stehle on Jun 25, 2013 7:04 AM

Version 16

Here is a quick summary at booting Linux on the i.MX 6 sabre sd platform.

This assumes you already have u-boot working on your platform as described here. This implies you already have a "working" Linux development environment with some ARM cross-compilers at hand (e.g. Debian + Emdebian).

Get Linux sources

We will use git to fetch Linux sources:

$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

This should create a linux directory with all the latest sources (after a while).

Note that for more stability you might want to checkout a release instead of the latest version; to do so, list the available release tags with e.g. git tag -l 'v3.*', and git checkout <the-desired-tag>.

Compile

Assuming your cross compiler is called e.g. arm-linux-gnueabihf-gcc, you can compile by doing:

$ cd linux

$ export ARCH=arm

$ export CROSS_COMPILE=arm-linux-gnueabihf-

$ make imx_v6_v7_defconfig

$ make

$ make uImage

This should create a number of files, including arch/arm/boot/uImage and arch/arm/boot/dts/imx6q-sabresd.dtb.

Put on SD

We need a proper FAT partition on the SD card, from which u-boot will be able to load the kernel and dtb. Also, we need to make sure we leave some space for u-boot starting from offset 1024B. Here is an example SD card layout:

+-----+------+--------+-----+----------------

| MBR | ... | u-boot | ... | FAT partition ...

+-----+------+--------+-----+----------------

0 512 1024 1M

(offsets in bytes)

Here is an example SD card layout, as displayed by fdisk:

Device Boot Start End Blocks Id System

/dev/sdc1 2048 8054783 4026368 c W95 FAT32 (LBA)

(units: 512B sectors)

You can format the FAT partition, mount, copy and unmount with:

$ mkfs.vfat /dev/<your-sd-card-first-partition>

$ mount /dev/<your-sd-card-first-partition> /mnt

$ cp arch/arm/boot/uImage arch/arm/boot/dts/imx6q-sabresd.dtb /mnt/

$ umount /mnt

Your SD card first partition is typically something in /dev/sd<X>1 or /dev/mmcblk<X>p1. Note that you need write permissions on the SD card for the command to succeed, so you might need to su - as root, or use sudo, or do a chmod a+w as root on the SD card device node to grant permissions to users.

Also, be sure to have u-boot on the SD card as explained in this post.

Boot!

That's it; u-boot already knows how to deal with your kernel by default so you are good to go. Insert the SD card into the SD card slot of your i.MX6 sabre sd platform, connect to the USB to UART port with a serial terminal set to 115200 baud, no parity, 8bit data and power up the platform. You should see u-boot messages:

U-Boot 2013.07-rc1-00014-g74771f4 (Jun 21 2013 - 16:27:39)

u-boot should load the uImage and dtb from SD card and boot the kernel:

(...)

reading uImage

4215344 bytes read in 449 ms (9 MiB/s)

Booting from mmc ...

reading imx6q-sabresd.dtb

22818 bytes read in 22 ms (1012.7 KiB/s)

## Booting kernel from Legacy Image at 12000000 ...

Image Name: Linux-3.10.0-rc6

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 4215280 Bytes = 4 MiB