經過一周的嘗試，我的pcduino mini linux系統跑起來了。下面可以專心做驅動開發，以及移植自己的Android系統。
準備一張tf卡，我用的1G Kingstorm。準備檔案：sunxi-spl.bin、u-boot.bin、script.bin、uImage、boot.scr、uEnv.txt、rootfs
linux最小系統制作過程(詳細過程見linux移植一二三)如下：
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ ls /dev/sdb
sdb sdb1
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo dd if=/dev/zero of=/dev/sdb bs=1M count=1
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo sfdisk -R /dev/sdb
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo cat <<EOT | sudo sfdisk --in-order -uM /dev/sdb
> 1,16,c
> ,,L
> EOT
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo mkfs.vfat /dev/sdb1
mkfs.vfat 3.0.7 (24 Dec 2009)
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo mkfs.ext4 /dev/sdb2
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo dd if=spl/sunxi-spl.bin of=/dev/sdb bs=1024 seek=8
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo dd if=u-boot.bin of=/dev/sdb bs=1024 seek=32
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo mount /dev/sdb1 /mnt/
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo cp ../linux-sunxi-sunxi-3.0/arch/arm/boot/uImage /mnt/
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo cp ../sunxi-tools-master/script.bin /mnt/
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo cp ../boot.scr /mnt/
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo cp ../uEnv.txt /mnt/
[email protected]:~/Si/A10/pcduino/u-boot-sunxi-sunxi$ sudo umount /dev/sdb1
/dev/sdb1 最後包括檔案：script.bin、uImage、boot.scr、uEnv.txt
[email protected]:~/Si/A10/pcduino$ sudo umount /dev/sdb2
[email protected]:~/Si/A10/pcduino$ sudo mount /dev/sdc2 /mnt/
[email protected]:~/Si/A10/pcduino$ sudo cp -pR rootfs/* /mnt/ -d
[email protected]:~/Si/A10/pcduino$ sudo umount /dev/sdc2
/dev/sdb2 最後包括rootfs中是以檔案，如下：
bin dev etc home lib linuxrc mnt proc run sbin sys tmp usr var
最後取下tf卡，插到pcDuino，設定序列槽115200 8 n 1，單闆預設從tf卡啟動。
啟動界面如下：
U-Boot 2012.10 (Apr 19 2013 - 18:46:44) Allwinner Technology
CPU: SUNXI Family
Board: pcDuino
I2C: ready
DRAM: 1 GiB
MMC: SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Hit any key to stop autoboot: 0
reading uEnv.txt
144 bytes read
Loaded environment from uEnv.txt
reading boot.scr
289 bytes read
Jumping to boot.scr
## Executing script at 44000000
Wrong image format for "source" command
reading script.bin
44900 bytes read
reading uImage
4693132 bytes read
## Booting kernel from Legacy Image at 48000000 ...
Image Name: Linux-3.0.62
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 4693068 Bytes = 4.5 MiB
Load Address: 40008000
Entry Point: 40008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK
Starting kernel ...
<6>Initializing cgroup subsys cpuset
<5>Linux version 3.0.62 ([email protected]) (gcc version 4.4.1 (Sourcery G++ Lite 2009q3-67) ) #1 PREEMPT Sat Apr 20 18:32:39 CST 2013
CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: sun4i
<6>Memory cut off:
<6> MALI : 0x5c000000 - 0x5fffffff ( 64 MB)
<4>Ignoring unrecognised tag 0x00000000
<6>Memory Reserved:
<6> SYS : 0x43000000 - 0x4300ffff ( 64 kB)
<6> VE : 0x44000000 - 0x48ffffff ( 80 MB)
<6> G2D : 0x49000000 - 0x49ffffff ( 16 MB)
<6> LCD : 0x5a000000 - 0x5bffffff ( 32 MB)
Memory policy: ECC disabled, Data cache writeback
<6>chip-id: A10 (AW1623 revision C)
<7>On node 0 totalpages: 245760
<7>free_area_init_node: node 0, pgdat c0887ea0, node_mem_map c094e000
<7> Normal zone: 1280 pages used for memmap
<7> Normal zone: 0 pages reserved
<7> Normal zone: 146176 pages, LIFO batch:31
<7> HighMem zone: 768 pages used for memmap
<7> HighMem zone: 97536 pages, LIFO batch:31
<7>pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
<7>pcpu-alloc: [0] 0
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 243712
<5>Kernel command line: console=ttyS0,115200 root=/dev/mmcblk0p2 rootwait loglevel=8 panic=10
<6>PID hash table entries: 4096 (order: 2, 16384 bytes)
<6>Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
<6>Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
<6>Memory: 448MB 512MB = 960MB total
<5>Memory: 833852k/833852k available, 149188k reserved, 393216K highmem
<5>Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
........//太長了，省略若幹
<6>mmc0: new high speed SD card at address 1234
[ 4.140000] mmc0: new high speed SD card at address 1234
<6>mmcblk0: mmc0:1234 SA01G 942 MiB
[ 4.160000] mmcblk0: mmc0:1234 SA01G 942 MiB
<6> mmcblk0: p1 p2
[ 4.170000] mmcblk0: p1 p2
<6>Console: switching to colour frame buffer device 160x45
[ 4.290000] Console: switching to colour frame buffer device 160x45
<4>regulator_init_complete: axp20_buck3: incomplete constraints, leaving on
[ 4.330000] regulator_init_complete: axp20_buck3: incomplete constraints, leaving on
<4>regulator_init_complete: axp20_buck2: incomplete constraints, leaving on
[ 4.350000] regulator_init_complete: axp20_buck2: incomplete constraints, leaving on
<4>regulator_init_complete: axp20_ldo4: incomplete constraints, leaving on
[ 4.360000] regulator_init_complete: axp20_ldo4: incomplete constraints, leaving on
<4>regulator_init_complete: axp20_ldo3: incomplete constraints, leaving on
[ 4.380000] regulator_init_complete: axp20_ldo3: incomplete constraints, leaving on
<4>regulator_init_complete: axp20_ldo2: incomplete constraints, leaving on
[ 4.390000] regulator_init_complete: axp20_ldo2: incomplete constraints, leaving on
<4>regulator_init_complete: axp20_ldo1: incomplete constraints, leaving on
[ 4.410000] regulator_init_complete: axp20_ldo1: incomplete constraints, leaving on
<6>sunxi-rtc sunxi-rtc: sunxi_rtc_gettime
[ 4.420000] sunxi-rtc sunxi-rtc: sunxi_rtc_gettime
<6>sunxi-rtc sunxi-rtc: read time 2010-1-1 0:0:10
[ 4.430000] sunxi-rtc sunxi-rtc: read time 2010-1-1 0:0:10
<6>sunxi-rtc sunxi-rtc: setting system clock to 2010-01-01 00:00:10 UTC (1262304010)
[ 4.440000] sunxi-rtc sunxi-rtc: setting system clock to 2010-01-01 00:00:10 UTC (1262304010)
<3>EXT3-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (240)
[ 4.460000] EXT3-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (240)
<3>EXT2-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (244)
[ 4.480000] EXT2-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (244)
<6>EXT4-fs (mmcblk0p2): recovery complete
[ 5.840000] EXT4-fs (mmcblk0p2): recovery complete
<6>EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 6.060000] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
<6>VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 6.080000] VFS: Mounted root (ext4 filesystem) on device 179:2.
<6>devtmpfs: mounted
[ 6.090000] devtmpfs: mounted
<6>Freeing init memory: 164K
[ 6.090000] Freeing init memory: 164K
mount: mounting devpts on /dev/pts failed: No such file or directory
mount: mounting /dev/mmcblk0p1 on /boot failed: No such file or directory
Please press Enter to activate this console.
Processing /etc/profile... Done
/ # ls
bin home lost+found run tmp
dev lib mnt sbin usr
etc linuxrc proc sys var
/ # ifconfig eth0
eth0 Link encap:Ethernet HWaddr 12:5B:BD:7D:C4:75
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:55 Base address:0x8000
/ # ifconfig eth0 172.16.1.133
<4>wemac wemac.0: WARNING: no IRQ resource flags set.
[ 2360.950000] wemac wemac.0: WARNING: no IRQ resource flags set.
<6>wemac wemac.0: eth0: link down
[ 2361.060000] wemac wemac.0: eth0: link down
<6>ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 2361.070000] ADDRCONF(NETDEV_UP): eth0: link is not ready
/ #
詳細移植過程見linux移植一、二、三。花了不少時間啊，這是移植心得。pcduino linux移植期間遇到了不少問題，總結如下：
1.pkg-config可以解決明明在自己機器上編譯好好的，在别人電腦上編譯就不行問題,它能為已安裝的庫時提供統一接口。了解pkg-config解決Package libusb-1.0 was not found in the pkg-config search path
2.用busybox制作檔案系統時，要注意檔案的屬性。包括動态連結、執行權限等。通過sudo cp -pR file1 file2 -d,保留檔案屬性，否則系統跑步起來。
cp指令選項含義如下：
- a 該選項通常在拷貝目錄時使用。它保留連結、檔案屬性，并遞歸地拷貝目錄，其作用等于dpR選項的組合。
- d 拷貝時保留連結。
- f 删除已經存在的目标檔案而不提示。
- i 和f選項相反，在覆寫目标檔案之前将給出提示要求使用者确認。回答y時目标檔案将被覆寫，是互動式拷貝。
- p 此時cp除複制源檔案的内容外，還将把其修改時間和通路權限也複制到新檔案中。
- r 若給出的源檔案是一目錄檔案，此時cp将遞歸複制該目錄下所有的子目錄和檔案。此時目标檔案必須為一個目錄名。
- l 不作拷貝，隻是連結檔案。
3.ubuntu下燒寫tf卡指令，這裡容易出問題，發現雜牌子的tf卡就不行，卡了一段時間，最後果斷Kingstorm
4.Kernel panic - not syncing: No init found. Try passing init= option to kernel,這個問題說了找不到init，而我設定init=/sbin/init，顯然沒問題。原因何在呢？
[email protected]hange:~/Si/A10/pcduino/rootfs$ ls sbin/ -l
lrwxrwxrwx 1 change change 14 2013-04-28 21:16 init -> ../bin/busybox
[email protected]:~/Si/A10/pcduino/rootfs$ file linuxrc
linuxrc: symbolic link to `bin/busybox'
發現bin/busybox是一個動态連結庫檔案，依賴交叉編譯鍊的相應庫。而交叉編譯鍊庫有很多，試了發現../arm-2009q3/arm-none-linux-gnueabi/libc/armv4t/lib/和 /home/change/tools/arm-2009q3/arm-none-linux-gnueabi/libc/armv4t/usr/lib/ 下的*.so*庫可以使用。
還有拷貝後linuxrc有1.9M左右，如果拷貝時沒加 -d選項，拷貝後隻有0位元組，啟動時也會出現上面問題。
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