基本内核编译

内核解压后停止

    2009年1月份，第一个发布版本出现，采用2.6.27.8版本，使用arm-vfp-linux-gnu 4.3.2的编译器，主机环境为Fedora 9。能够编译通过，却无法正常启动，在解压内核后就停止了。

    如下是串口终端的信息：

TFTP from server 192.168.7.110; our IP address is 192.168.7.236

Filename 'uImage'.

Load address: 0x80100000

Loading: #################################################################

         ################################################

done

Bytes transferred = 1648452 (192744 hex)

## Booting kernel from Legacy Image at 80100000 ...

   Image Name:   Linux-2.6.27.8

   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    1648388 Bytes =  1.6 MB

   Load Address: 80008000

   Entry Point:  80008000

   Verifying Checksum ... OK

   Loading Kernel Image ... OK

OK

Starting kernel ...

Starting kernel ...

Uncompressing Linux............................................................................... done, booting the kernel.

    与2.6.25版本的启动信息对比，内核校验信息里面少了XIP选项。

    此时的内核启动参数是：

CONFIG_CMDLINE="root=/dev/nfsroot rw console=tty0 console=ttyS0,115200n81 nfsroot=192.168.7.231:/home/chenxibing/lpc3250/ltib/rootfs ip=192.168.7.236:192.168.7.1:192.168.7.1:255.255.255.0:nxp.zlgmcu.com:eth0:off"

    分析

    done, booting the kernel. 是从arch/arm/boot/compressed/misc.c文件中打印出来的。

    配置了内核的1HZ指示灯，可是主板的指示灯并没有闪烁，可见内核没有运行。应该是内核加载的问题。

    解决

    问题不在内核，而在U-Boor。由于之前使用2.6.25配套的u-boot，一些参数不同。更换成2.6.27.8的U-Boot，并设置相应的参数后问题解决，能够正常启动了。

    bootlog：

TFTP from server 192.168.7.110; our IP address is 192.168.7.236

Filename 'uImage'.

Load address: 0x80010000

Loading: #################################################################

         ################################################

done

Bytes transferred = 1648380 (1926fc hex)

## Booting kernel from Legacy Image at 80010000 ...

   Image Name:   Linux-2.6.27.8

   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    1648316 Bytes =  1.6 MB

   Load Address: 80008000

   Entry Point:  80008000

   Verifying Checksum ... OK

   Loading Kernel Image ... OK

OK

Starting kernel ...

Uncompressing Linux................................................................................ done, booting the kernel.

Linux version 2.6.27.8 ([e-mail]) (gcc version 4.3.2 (crosstool-NG-1.3.1) ) #8 PREEMPT Tue Feb 3 17:13:38 CST 2009

CPU: ARM926EJ-S [41069264] revision 4 (ARMv5TEJ), cr=00053177

Machine: Phytec 3250 board with the LPC3250 Microcontroller

Memory policy: ECC disabled, Data cache writeback

CPU0: D VIVT write-back cache

CPU0: I cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets

CPU0: D cache: 32768 bytes, associativity 4, 32 byte lines, 256 sets

Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256

Kernel command line: console=ttyS0,115200n81 root=/dev/nfs rw nfsroot=192.168.1.51:/home/usb10132/dev/ltib-8-1-2-sv/rootfs ip=dhcp init=/sbin/init

PID hash table entries: 256 (order: 8, 1024 bytes)

Console: colour dummy device 80x30

Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)

Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)

Memory: 64MB = 64MB total

Memory: 61396KB available (3128K code, 225K data, 104K init)

Calibrating delay loop... 103.83 BogoMIPS (lpj=519168)

Mount-cache hash table entries: 512

CPU: Testing write buffer coherency: ok

停在loop: module loaded处

    选中[ ] Check to enable MII support or leave disabled for RMII support 后会出现这个问题。

配置菜单的变量

PHY3250的两个变量，在c代码中实际上没有用到。

PHY3250_CPU_MODULE_1304_0

PHY3250_CPU_MODULE_1304_1

PHY3250的两外3个变量在C代码中也没有用到。

CONFIG_PHY3250_CARRIER_1305_01

CONFIG_PHY3250_CARRIER_1305_2

CONFIG_PHY3250_CARRIER_1305_3

只有LCD相关的几个变量用到了，用于处理背光和电源等差异。

CONFIG_PHY3250_LCD_PANEL

CONFIG_PHY3250_QVGA_PANEL_1307_0

CONFIG_PHY3250_QVGA_PANEL_1307_1

保留内核源代码

dist/lfs-5.1/kernel/kernel-common.tmpl

320 %Clean

321 rm -rf $RPM_BUILD_ROOT

322 if [ -z "$PKG_KERNEL_LEAVESRC" ]

323 then

324     rm -f $RPM_BUILD_DIR/linux

325 fi