Akagi201
11/18/2014 - 1:34 PM

gentoo-on-pcduino.md

gentoo-on-pcduino.md
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cross-compiler

  • crossdev -S -t armv7a-hardfloat-linux-gnueabi

u-boot + SPL

  • SPL是上电后启动代码, 用于启动u-boot.
  • SPL完全取代了Allwinner的boot0跟boot1代码.
  • NAND启动是 ROM -> boot0 -> boot1 -> linux kernel
  • SD启动是 ROM -> spl -> u-boot -> linux kernel
  • 如果用livesuite的image做的SD卡也是有boot0跟boot1的.
  • u-boot repo: https://github.com/linux-sunxi/u-boot-sunxi
  • sunxi是主分支, 与upstream u-boot(master)同步.

compile u-boot

  • To see a list of typical targets: make help
  • See boards.cfg for a list of known board types.
  • grep sunxi boards.cfg | awk ‘{print $7}’
  • cat boards.cfg | grep pcDuino3 对比可以看到跟cubieboard2基本一样.
Active  arm         armv7          sunxi       -               sunxi               Linksprite_pcDuino3                  sun7i:LINKSPRITE_PCDUINO3,SPL,SUNXI_GMAC,FAST_MBUS                                                                                -
  • Board names ending with _FEL are configured for USB-Booting.
  • Out-of-Source compile u-boot:
make distclean
mkdir build
CROSS_COMPILE=armv7a-hardfloat-linux-gnueabi- make Linksprite_pcDuino3_config O=build
CROSS_COMPILE=armv7a-hardfloat-linux-gnueabi- make O=build -j8

生成文件

  • 完整包含u-boot跟SPL: u-boot-sunxi-with-spl.bin
  • u-boot: u-boot.img
  • SPL: spl/sunxi-spl.bin

对SD卡进行分区

  • mac插入sd卡后, 卸载掉自动挂载的分区, 在virtualbox的port配置上添加对应的usb口的sd卡, 这样在vbox中就能识别到sd卡了.
  • mac上的fdisk命令跟linux上的不同, 在virtualbox中对SD卡进行分区, 也可以用板子flash上的系统直接做.
root@ubuntu:~# fdisk /dev/mmcblk0

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-31260671, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-31260671, default 31260671): +64M

Command (m for help): n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p): p
Partition number (1-4, default 2):
Using default value 2
First sector (133120-31260671, default 133120):
Using default value 133120
Last sector, +sectors or +size{K,M,G} (133120-31260671, default 31260671):
Using default value 31260671

Command (m for help): p

Disk /dev/mmcblk0: 16.0 GB, 16005464064 bytes
4 heads, 16 sectors/track, 488448 cylinders, total 31260672 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

        Device Boot      Start         End      Blocks   Id  System
/dev/mmcblk0p1            2048      133119       65536   83  Linux
/dev/mmcblk0p2          133120    31260671    15563776   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
  • mkfs.ext2 /dev/mmcblk0p1, mkfs.ext4 /dev/mmcblk0p2
  • sudo mount -t vfat /dev/sdb1 /mnt
  • cd /mnt
  • vim uEnv.txt
fdt_high=ffffffff
loadkernel=fatload mmc 0 0x46000000 uImage
loaddtb=fatload mmc 0 0x49000000 dtb
bootargs=console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p2 rootwait
uenvcmd=run loadkernel && run loaddtb && bootm 0x46000000 - 0x49000000

建立boot分区

  • dd命令在虚拟机里写入会失败, 在mac下dd, sudo dd if=u-boot-sunxi-with-spl.bin of=/dev/disk2 bs=1024 seek=8

建立root分区

  • 下载stage3-armv7a_hardfp-20140819.tar.bz2, releases/arm/autobuilds/current-stage3/, http://distfiles.gentoo.org/releases/arm/autobuilds/current-stage3-armv7a_hardfp/
  • 在pcduino上的ubuntu系统中, 启动后, 再插入sd卡, 然后mkdir -p /mnt/gentoo/, mount /dev/mmcblp0p2 /mnt/gentoo/, wget http://distfiles.gentoo.org/releases/arm/autobuilds/current-stage3-armv7a_hardfp/, tar xjpf stage3-armv7a_hardfp-20140819.tar.bz2 -C /mnt/gentoo/
  • 修改/etc/fstab

编译内核

  • git clone git://github.com/linux-sunxi/linux-sunxi.git
  • make help
  • mkdir build
  • CROSS_COMPILE=armv7a-hardfloat-linux-gnueabi- ARCH=arm make sun7i_defconfig O=build -j3
  • CROSS_COMPILE=armv7a-hardfloat-linux-gnueabi- ARCH=arm make uImage modules O=build -j3
  • su
  • CROSS_COMPILE=/usr/bin/armv7a-hardfloat-linux-gnueabi- ARCH=arm make modules_install INSTALL_MOD_PATH=/mnt/gentoo

fex2bin

  • git clone git://github.com/linux-sunxi/sunxi-tools.git
  • make fex2bin

board configurations

  • git clone git://github.com/linux-sunxi/sunxi-boards.git

硬件连接

  • pcDuino <-> 串口调试 <-> PC USB
  • pcDuino <-> OTG <-> PC USB

overlay

  • portage位置
  • emerge支持cross-compile
  • overlay
  • layman支持