君正4750开发板使用日记2-Linux环境搭建与内核编译

Linux环境搭建与内核编译

上一篇中把4750开发板与PC的硬件连通了，这一篇记录的是基本的Linux环境的搭建。其实官方文档已经比较细了，网上也有大量的资料，但到实践中还是有一些问题，在此记录一下。

首先是安装一个LINUX系统来做开发环境了。官方推荐当然是直接装一个，但是一方面我平时很多工作还是要在Windows下完成，另一方面我也习惯了用Windows，因此我还是没有直接装。

最开始搞了个VMWare虚拟机装了个RedHat，后来又尝试了一个Cygwin，下载了老半天装完，然后鼓弄了很久，觉得都不好用。后来看官方文档上是以Ubuntu为例，于是在VMWare上装了个Ubuntu桌面，但VMWare Tools老装不上，查了下说要重新编译内核，试了几回，内核是编译过了，但VMWare Tools还是有一部分编译不了，最重要的是共享文件那块没法用。我一怒之下，把装好的系统删了。后来下载了一个别人已经装好的Ubuntu Server 9.10镜像，据说已经装好了VMWare Tools，拉下来一看其实也没有装，但我懒得再折腾了，就基于这个系统开始配置开发环境了。

由于没有搞掂VMWare与主机的文件共享，我只好把JZ4750的源码和工具包打包成一个ISO文件挂到Ubuntu的CDROM上访问。按照文档的指示，安装编译mipseltools-gcc412-glibc261.tar.bz2，编译了君正PATCH过的UBOOT和LINUX内核，烧写和配置UBOOT，再安装TFTP和NFS网络文件系统，配置UBOOT从NFS加载LINUX内核。文档上是先安装TFTP和NFS，其实可以放到后一步与根文件系统一块去做更合乎习惯。

具体过程基本上都是在putty终端上完成。我一般在WINDOWS上开两个putty，一个连开发板COM口，另一个连VMWare的ubuntu终端。如果你本来就是用LINUX系统，那你可以像官方文档说的一样用minicom连COM口。

由于我装的是ubuntu server，是没有桌面的，原始大小只有900M多一点，压缩一下只有208M，因此我不在上面做图形开发。由于选择用QT做GUI，QT提供了WINDOWS下的源码和开发环境，可以跟Visual Studio一起用，因此可以在WINDOWS下开发完，再转到ubuntu上交叉编译，再放到开发板上运行。

进行编译操作前，最好确认有足够的磁盘空间，因为中间编译时间较长，需要很大磁盘空间，要是因为空间不够导致中止就不划算了。
我的虚拟磁盘最大设置是20G。

为了较详细地记录安装编译过程，我把所有过程重新做了一次，把主要的操作命令和输出结果也贴上来，虽有些繁琐，但对新人理解和比较整个安装过程是有些帮助的。我自己在安装时，就很希望有这么个日志记录。

安装基本的编译工具gcc,g++,make之类的，Ubuntu提供了一个build-essential软件包可以直接全装上：

（如果不是以root登录，要在命令前加sudo提升权限；安装过程需要从网上下载数据，请保持网络连接；如果是刚装好的系统，可能需要先执行apt-get update更新软件库列表）
root@ubuntu:/# apt-get install build-essential
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
ssl-cert
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
binutils cpp-4.4 dpkg-dev fakeroot g++ g++-4.4 gcc gcc-4.4 gcc-4.4-base
libc-bin libc-dev-bin libc6 libc6-dev libc6-i686 libgcc1 libgomp1 libstdc++6
libstdc++6-4.4-dev linux-libc-dev
Suggested packages:
binutils-doc gcc-4.4-locales debian-keyring debian-maintainers g++-multilib
g++-4.4-multilib gcc-4.4-doc libstdc++6-4.4-dbg gcc-multilib manpages-dev
autoconf automake1.9 libtool flex bison gdb gcc-doc gcc-4.4-multilib
libmudflap0-4.4-dev libgcc1-dbg libgomp1-dbg libmudflap0-dbg libcloog-ppl0
libppl-c2 libppl7 glibc-doc libstdc++6-4.4-doc
The following NEW packages will be installed:
binutils build-essential dpkg-dev fakeroot g++ g++-4.4 gcc gcc-4.4
libc-dev-bin libc6-dev libgomp1 libstdc++6-4.4-dev linux-libc-dev
The following packages will be upgraded:
cpp-4.4 gcc-4.4-base libc-bin libc6 libc6-i686 libgcc1 libstdc++6
7 upgraded, 13 newly installed, 0 to remove and 54 not upgraded.
Need to get 26.9MB of archives.
After this operation, 61.6MB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://us.archive.ubuntu.com karmic-updates/main libc-bin 2.10.1-0ubuntu16 [715kB]
Get:2 http://us.archive.ubuntu.com karmic-updates/main libc6 2.10.1-0ubuntu16 [3,759kB]
Get:3 http://us.archive.ubuntu.com karmic-updates/main libc6-i686 2.10.1-0ubuntu16 [1,199kB]
...
Get:19 http://us.archive.ubuntu.com karmic/main build-essential 11.4 [7,172B]
Get:20 http://us.archive.ubuntu.com karmic/main fakeroot 1.12.4ubuntu1 [126kB]
Fetched 26.9MB in 19min 55s (22.5kB/s)
Preconfiguring packages ...
(Reading database ... 40434 files and directories currently installed.)
Preparing to replace libc-bin 2.10.1-0ubuntu15 (using .../libc-bin_2.10.1-0ubuntu16_i386.deb) ...
Unpacking replacement libc-bin ...
Processing triggers for man-db ...
...
Preparing to replace libstdc++6 4.4.1-4ubuntu8 (using .../libstdc++6_4.4.1-4ubuntu9_i386.deb) ...
Unpacking replacement libstdc++6 ...
Processing triggers for man-db ...
Setting up libstdc++6 (4.4.1-4ubuntu9) ...

Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Selecting previously deselected package binutils.
(Reading database ... 40434 files and directories currently installed.)
Unpacking binutils (from .../binutils_2.20-0ubuntu2_i386.deb) ...
...
Selecting previously deselected package fakeroot.
Unpacking fakeroot (from .../fakeroot_1.12.4ubuntu1_i386.deb) ...
Processing triggers for man-db ...
Setting up libc6-i686 (2.10.1-0ubuntu16) ...

Setting up cpp-4.4 (4.4.1-4ubuntu9) ...
...

Setting up libstdc++6-4.4-dev (4.4.1-4ubuntu9) ...
Setting up g++-4.4 (4.4.1-4ubuntu9) ...
Setting up g++ (4:4.4.1-1ubuntu2) ...
update-alternatives: using /usr/bin/g++ to provide /usr/bin/c++ (c++) in auto mode.

Setting up build-essential (11.4) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
root@ubuntu:/# make
make: *** No targets specified and no makefile found. Stop.
root@ubuntu:/#

把君正提供的几个TAR安装打包了ISO挂到虚拟机的CDROM上，然后按文档进行解压安装。
root@ubuntu:/# mount /dev/cdrom /mnt
mount: block device /dev/sr0 is write-protected, mounting read-only
root@ubuntu:/# ls /mnt
celinux-040503-jz-20080409.patch.gz mipseltools-gcc412-lnx24.tar.gz
celinux-040503.tar.bz2 mipseltools-gcc412-lnx26.tar.gz
linux2.4_developer_guide.pdf mips_toolchain_guide.pdf
linux-2.6.24.3-jz-20090218.patch.gz MPlayer-1.0rc2-20090218.tar.bz2
linux-2.6.24.3.tar.bz2 mxu_user_guide.pdf
linux2.6_developer_guide_v1.4.1.pdf root-jz-20090216.tar.bz2
linux_resource_guide_v1.1.pdf u-boot-1.1.6-jz-20090216.patch.gz
mipsel-gcc4.1-cygwin-nopic.tar.bz2 uboot-1.1.6.tar.gz
mipseltools-gcc412-glibc261.tar.bz2 uboot_developer_guide.pdf
root@ubuntu:/#

首先安装MIPS交叉编译工具。我理解的所谓交叉编译，就是从一个系统上编译程序给另一个不同的系统使用。
对我的实际来说，就是从PC电脑的ubuntu linux系统上编译程序给君正4750开发板mips的系统使用。
root@ubuntu:/opt# mkdir -p /opt
root@ubuntu:/# cd /opt
root@ubuntu:/opt# tar -xjf /mnt/mipseltools-gcc412-glibc261.tar.bz2
root@ubuntu:/opt# ls
mipseltools-gcc412-glibc261
root@ubuntu:/opt#

写一个简单C文件验证一下：
root@ubuntu:/opt# vi hello.c

按i进入编辑模式，输入以下内容，再按ESC，输入:wq保存退出：
#include <stdio.h>
int main()
{
printf("hello jz-mipsel-linux/r/n");
return 0;
}

root@ubuntu:/opt# /opt/mipseltools-gcc412-glibc261/bin/mipsel-linux-gcc -o hello hello.c
root@ubuntu:/opt# ls
hello hello.c mipseltools-gcc412-glibc261
root@ubuntu:/opt# ./hello
-bash: ./hello: cannot execute binary file
root@ubuntu:/opt#
编译成功，当然了，编译的输出程序是mips指令系统的，只能在开发板上运行，不能在本机运行。

接着是交叉编译用于mips架构的UBOOT和Linux内核。其实开发板上默认已经有这两个东东了，如果你只想编写程序不想修改内核的话，应该可以不用编译烧录。
不过既然是搞开发的，不管用不用得着，自然还是要试一试的。
解压UBOOT，打上君正的补丁：
root@ubuntu:/opt/u-boot-1.1.6# tar -xf /mnt/uboot-1.1.6.tar.gz
root@ubuntu:/opt# ls
hello hello.c mipseltools-gcc412-glibc261 u-boot-1.1.6
root@ubuntu:/opt# cd u-boot-1.1.6/
root@ubuntu:/opt/u-boot-1.1.6# gzip -cd /mnt/u-boot-1.1.6-jz-20090216.patch.gz |patch -p1
patching file ...
...
patching file nand_spl/nand_boot_jz4750.c
patching file nand_spl/nand_boot_jz5730.c
patching file net/eth.c
patching file README.JZ
patching file tools/bmp_logo.c
root@ubuntu:/opt/u-boot-1.1.6#

进行配置和交叉编译：
root@ubuntu:/opt/u-boot-1.1.6# export PATH=/opt/mipseltools-gcc412-glibc261/bin:$PATH
root@ubuntu:/opt/u-boot-1.1.6# make apus_nand_config
Compile NAND boot image for apus
Configuring for apus board...
root@ubuntu:/opt/u-boot-1.1.6# make
for dir in tools examples post post/cpu ; do make -C $dir _depend ; done
make[1]: Entering directory `/opt/u-boot-1.1.6/tools'
ln -s ../common/environment.c environment.c
ln -s ../lib_generic/crc32.c crc32.c
make[1]: Leaving directory `/opt/u-boot-1.1.6/tools'
make[1]: Entering directory `/opt/u-boot-1.1.6/tools'
make[1]: Nothing to be done for `_depend'.
make[1]: Leaving directory `/opt/u-boot-1.1.6/tools'
make[1]: Entering directory `/opt/u-boot-1.1.6/examples'

...

make -C tools all
make[1]: Entering directory `/opt/u-boot-1.1.6/tools'
gcc -Wall -pedantic -idirafter /opt/u-boot-1.1.6/include -idirafter /opt/u-boot-1.1.6/include2 -idirafter /opt/u-boot-1.1.6/include -DTEXT_BASE=0x80100000 -DUSE_HOSTCC

-O -c -o img2srec.o img2srec.c
gcc -Wall -pedantic -idirafter /opt/u-boot-1.1.6/include -idirafter /opt/u-boot-1.1.6/include2 -idirafter /opt/u-boot-1.1.6/include -DTEXT_BASE=0x80100000 -DUSE_HOSTCC

-O -o img2srec img2srec.o
strip img2srec
gcc -g -Wall -pedantic -idirafter /opt/u-boot-1.1.6/include -idirafter /opt/u-boot-1.1.6/include2 -idirafter /opt/u-boot-1.1.6/include -DTEXT_BASE=0x80100000 -

DUSE_HOSTCC -O -c -o mkimage.o mkimage.c
gcc -g -Wall -pedantic -idirafter /opt/u-boot-1.1.6/include -idirafter /opt/u-boot-1.1.6/include2 -idirafter /opt/u-boot-1.1.6/include -DTEXT_BASE=0x80100000 -

DUSE_HOSTCC -O -c -o crc32.o crc32.c
gcc -Wall -pedantic -idirafter /opt/u-boot-1.1.6/include -idirafter /opt/u-boot-1.1.6/include2 -idirafter /opt/u-boot-1.1.6/include -DTEXT_BASE=0x80100000 -DUSE_HOSTCC

-O -o mkimage mkimage.o crc32.o
.....
dd bs=1024 count=256 if=/opt/u-boot-1.1.6/nand_spl/junk6 of=/opt/u-boot-1.1.6/nand_spl/u-boot-spl-pad.bin
256+0 records in
256+0 records out
262144 bytes (262 kB) copied, 1e-09 s, 262 TB/s
rm -f /opt/u-boot-1.1.6/nand_spl/junk*
make[1]: Leaving directory `/opt/u-boot-1.1.6/nand_spl/board/apus'
cat nand_spl/u-boot-spl-pad.bin u-boot.bin > u-boot-nand.bin
root@ubuntu:/opt/u-boot-1.1.6#
编译成功，生成u-boot-nand.bin，可烧录到开发板上。

接下来解压、补丁、配置和交叉编译mips下的linux内核：
root@ubuntu:/opt# export PATH=/opt/mipseltools-gcc412-glibc261/bin:$PATH //如果前面已经设置了路径，这里可以不需要了。
root@ubuntu:/opt# tar -xjf /mnt/linux-2.6.24.3.tar.bz2
root@ubuntu:/opt# ls
hello hello.c linux-2.6.24.3 mipseltools-gcc412-glibc261 u-boot-1.1.6
root@ubuntu:/opt# cd linux-2.6.24.3/
root@ubuntu:/opt/linux-2.6.24.3# gzip -cd /mnt/linux-2.6.24.3-jz-20090218.patch.gz | patch -p1
patching file ...
...
patching file sound/soc/jz4740/jz4740-ac97.c
patching file sound/soc/jz4740/jz4740-ac97.h
patching file sound/soc/jz4740/jz4740-i2s.c
patching file sound/soc/jz4740/jz4740-i2s.h
patching file sound/soc/jz4740/jz4740-pcm.c
patching file sound/soc/jz4740/jz4740-pcm.h
patching file sound/soc/jz4740/Kconfig
patching file sound/soc/jz4740/Makefile
patching file sound/soc/jz4740/pavo.c
patching file sound/soc/Kconfig
patching file sound/soc/Makefile
root@ubuntu:/opt/linux-2.6.24.3#
root@ubuntu:/opt/linux-2.6.24.3# make apus_defconfig
HOSTCC scripts/basic/fixdep
scripts/basic/fixdep.c: In function ‘traps’:
scripts/basic/fixdep.c:377: warning: dereferencing type-punned pointer will break strict-aliasing rules
...
scripts/kconfig/lex.zconf.c:1639: warning: ‘input’ defined but not used
HOSTLD scripts/kconfig/conf
*
* Linux Kernel Configuration
*
*
* Machine selection
*
System type
1. Ingenic JZ4730 PMP board (JZ4730_PMP)
2. Ingenic JZ4740 PAVO board (JZ4740_PAVO)
3. Ingenic JZ4740 LEO board (JZ4740_LEO)
4. Ingenic JZ4740 LYRA board (JZ4740_LYRA)
5. Ingenic JZ4725 DIPPER board (JZ4725_DIPPER)
6. Ingenic JZ4720 VIRGO board (JZ4720_VIRGO)
7. Ingenic JZ4750 FUWA board (JZ4750_FUWA)
8. Ingenic JZ4750d FUWA1 board (JZ4750D_FUWA1) (NEW)
> 9. Ingenic JZ4750 APUS board (JZ4750_APUS)
10. Alchemy processor based machines (MACH_ALCHEMY)
11. Basler eXcite smart camera (BASLER_EXCITE)
...
45. Wind River PPMC board (WR_PPMC)
choice[1-45]: 9
Endianess selection
> 1. Little endian (CPU_LITTLE_ENDIAN)
choice[1]: 1
*
* CPU selection
*
CPU type
> 1. MIPS32 Release 1 (CPU_MIPS32_R1)
choice[1]: 1
*
* Kernel type
*
Kernel code model
> 1. 32-bit kernel (32BIT)
choice[1]: 1
Kernel page size
> 1. 4kB (PAGE_SIZE_4KB)
2. 16kB (PAGE_SIZE_16KB)
3. 64kB (PAGE_SIZE_64KB)
choice[1-3]: 1

....
CRC-CCITT functions (CRC_CCITT) [N/m/y/?] n
CRC16 functions (CRC16) [N/m/y/?] n
CRC ITU-T V.41 functions (CRC_ITU_T) [N/m/y/?] n
CRC32 functions (CRC32) [Y/?] y
CRC7 functions (CRC7) [N/m/y/?] n
CRC32c (Castagnoli, et al) Cyclic Redundancy-Check (LIBCRC32C) [N/m/y/?] n
#
# configuration written to .config
#
root@ubuntu:/opt/linux-2.6.24.3#
root@ubuntu:/opt/linux-2.6.24.3# make uImage
scripts/kconfig/conf -s arch/mips/Kconfig
CHK include/linux/version.h
UPD include/linux/version.h
CHK include/linux/utsrelease.h
UPD include/linux/utsrelease.h
SYMLINK include/asm -> include/asm-mips
CC arch/mips/kernel/asm-offsets.s
GEN include/asm-mips/asm-offsets.h
CALL scripts/checksyscalls.sh
HOSTCC scripts/genksyms/genksyms.o
SHIPPED scripts/genksyms/lex.c
SHIPPED scripts/genksyms/parse.h
SHIPPED scripts/genksyms/keywords.c
HOSTCC scripts/genksyms/lex.o
scripts/genksyms/lex.c:1481: warning: ‘input’ defined but not used
SHIPPED scripts/genksyms/parse.c
HOSTCC scripts/genksyms/parse.o
HOSTLD scripts/genksyms/genksyms
CC scripts/mod/empty.o
HOSTCC scripts/mod/mk_elfconfig
MKELF scripts/mod/elfconfig.h
HOSTCC scripts/mod/file2alias.o
...
CC drivers/mtd/mtdchar.o
CC drivers/mtd/mtd_blkdevs.o
uudecode drivers/mtd/mtdblock-jz.uu -o drivers/mtd/mtdblock-jz.o
make[2]: uudecode: Command not found
make[2]: *** [drivers/mtd/mtdblock-jz.o] Error 127
make[1]: *** [drivers/mtd] Error 2
make: *** [drivers] Error 2
root@ubuntu:/opt/linux-2.6.24.3#

编译失败，没有找到uudecode，看君正的文档是因为缺sharutils这个包，于是安装之：

root@ubuntu:/opt/linux-2.6.24.3# apt-get install sharutils
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
ssl-cert
Use 'apt-get autoremove' to remove them.
Suggested packages:
mailx
The following NEW packages will be installed:
sharutils
0 upgraded, 1 newly installed, 0 to remove and 54 not upgraded.
Need to get 109kB of archives.
After this operation, 999kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com karmic/main sharutils 1:4.6.3-1build2 [109kB]
Fetched 109kB in 4s (25.7kB/s)
Selecting previously deselected package sharutils.
(Reading database ... 42798 files and directories currently installed.)
Unpacking sharutils (from .../sharutils_1%3a4.6.3-1build2_i386.deb) ...
Processing triggers for install-info ...
Processing triggers for man-db ...
Setting up sharutils (1:4.6.3-1build2) ...
Ignoring install-info called from maintainer script
The package sharutils should be rebuild with new debhelper to get trigger support

root@ubuntu:/opt/linux-2.6.24.3#
再编译：
root@ubuntu:/opt/linux-2.6.24.3# make uImage
...
mipsel-linux-objcopy -O binary --remove-section=.reginfo --remove-section=.mdebug --remove-section=.comment --remove-section=.note --remove-section=.pdr --remove-

section=.options --remove-section=.MIPS.options vmlinux arch/mips/boot/vmlinux.bin
rm -f arch/mips/boot/vmlinux.bin.gz
gzip -9 arch/mips/boot/vmlinux.bin
mkimage -A mips -O linux -T kernel -C gzip /
-a 0x80010000 -e 0x80326730 /
-n 'Linux-2.6.24.3' /
-d arch/mips/boot/vmlinux.bin.gz arch/mips/boot/uImage
make[1]: mkimage: Command not found
make[1]: *** [uImage] Error 127
make: *** [uImage] Error 2
root@ubuntu:/opt/linux-2.6.24.3#
这回缺mkimage，也是意料之中了，按君正的文档说明，从u-boot/tools目录下复制到/usr/sbin（放其它目录也行，只要在PATH范围内能找到），再编译：
root@ubuntu:/opt/linux-2.6.24.3# cp ../u-boot-1.1.6/tools/mkimage /usr/sbin/
root@ubuntu:/opt/linux-2.6.24.3# make uImage
CHK include/linux/version.h
CHK include/linux/utsrelease.h
CALL scripts/checksyscalls.sh
CHK include/linux/compile.h
mipsel-linux-objcopy -O binary --remove-section=.reginfo --remove-section=.mdebug --remove-section=.comment --remove-section=.note --remove-section=.pdr --remove-

编译成功，可以按文档烧录到开发板上了。

烧录过程大概如下：
1.把上面编译好的的u-boot-nand.bin和uImage文件复制到USB_BOOT.exe目录
2.给开发板和PC接上小USB线，运行USB_BOOT.exe，出现命令行窗口
3.按住SW6，再按一下RESET键，松开SW6键，开发板进入白屏状态
4.输入>boot 0，屏幕上出现Configure success字样
5.擦除所有分区：>nerase 0 4096 0 0
6.也可以单独探险uboot分区：>nerase 0 8 0 0 擦除uImage分区：>nerase 8 8 0 0
7.写uboot：>nprog 0 u-boot-nand.bin 0 0 -n
8.写uImage：>nprog 1024 uImage.bin 0 0 -n

屏幕日志输出如下：

Welcome!
USB Boot Host Software!
USB Boot Software current version: 1.4b
Handling user command.
USBBoot :> boot 0

Checking state of No.0 device: Unboot
Now booting No.0 device:
Download stage one program and execute at 0x80002000: Pass
Download stage two program and execute at 0x80c00000: Pass
Boot success!
Now configure No.0 device:
Now checking whether all configure args valid:
Current device information: CPU is Jz4750
Crystal work at 24MHz, the CCLK up to 336MHz and PMH_CLK up to 112MHz
Total SDRAM size is 16 MB, work in 4 bank and 32 bit mode
Nand page size 2048, ECC offset 24, bad block ID 127, use 1 plane mode
Configure success!
USBBoot :> nerase 0 4096 0 0

Erasing No.0 device No.0 flash...... Finish!
Operation end position : 4096
Force erase ,no bad block infomation !
USBBoot :> nprog 0 u-boot-nand.bin 0 0 -n

Programing No.0 device...
Erasing No.0 device No.0 flash...... Finish!
Operation end position : 2
Force erase ,no bad block infomation !
Total size to send in byte is :266932
Image type : without oob
It will cause 2 times buffer transfer.
No.1 Programming... Finish! Checking... pass! End at 128
No.2 Programming... Finish! Checking... pass! End at 131
USBBoot :> nprog 1024 uImage 0 0 -n

Programing No.0 device...
Erasing No.0 device No.0 flash...... Finish!
Operation end position : 15
Force erase ,no bad block infomation !
Total size to send in byte is :1784168
Image type : without oob
It will cause 7 times buffer transfer.
No.1 Programming... Finish! Checking... pass! End at 1152
No.2 Programming... Finish! Checking... pass! End at 1280
No.3 Programming... Finish! Checking... pass! End at 1408
No.4 Programming... Finish! Checking... pass! End at 1536
No.5 Programming... Finish! Checking... pass! End at 1664
No.6 Programming... Finish! Checking... pass! End at 1792
No.7 Programming... Finish! Checking... pass! End at 1896
USBBoot :> exit

烧写完后，按RESET键重启，COM口输出如下：

NAND Secondary Program Loader

Starting U-Boot ...

U-Boot 1.1.6 (May 21 2009 - 16:21:12)

Board: Ingenic APUS (CPU Speed 336 MHz)
DRAM: 64 MB
Flash: 0 kB
NAND:1024 MiB
*** Warning - bad CRC or NAND, using default environment

In: serial
Out: lcd
Err: lcd
Net: JZ ETHERNET
Hit any key to stop autoboot: 0

NAND read: device 0 offset 0x200000, size 0x200000
2097152 bytes read: OK
## Booting image at 80600000 ...
Image Name: Linux-2.6.24.3
Image Type: MIPS Linux Kernel Image (gzip compressed)
Data Size: 1784104 Bytes = 1.7 MB
Load Address: 80010000
Entry Point: 803117d0
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK

Starting kernel ...

到这一步，内核已经编译启动成功，接下来是根文件系统的问题了。关于TFTP和NFS网络根文件系统下一篇再细述。