/*****************************************************************************************************************
Document Author : ELvins Fu
Digtal technology park, A3 -06 , shenzhen, China
*************************************************************************************************************
Module : Unversion Gateway Application
Software Version : 6.1.1
Date ： 2015-2016
Description： the document include the kernel modilfied by special needs.
********************************************************************************************************************/
驱动环境kernel说明
Version ：0.1
简 介
本文档适用于Lantiq’s CPE 软件软件组件Universal Gateway（UGW）Release 6.1.1 版本的kernel的分析，对于其他类似环境有这参考的价值，对于其他环境也可以参照本环境进行分析。
本文档既对kernel进行小量地分析，又根据大麦盒子的硬件需求，介绍了demo版默认的uboot从NAND Flash启动方式转变为SPI Flash启动的配置更改，当然，对以后的需求，如从Nor Flash也具有重要的参考意义。
篇 二
篇二介绍的是在nand flash转spi flash的过程中的uboot启动之加载内核的配置和更改的情况。
1、内核挂载分区的情况
[ 2.850000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
假设你有ramdisk，那么检查该ramdisk的启动地址，格式等等。再有这些没错误的话，建议检查下你的内核大小，解压后的地址是否覆盖了ramdisk的地址，如果是这样，在linux启动的时候，会在最开始报一个地址重叠的警告，虽然不会影响内核后续的启动，但是会影响到后来ramdisk及filesystem的加载。
2、修改linux-3.10.12/drivers/spi$ sudo vi ltq_sflash.c
1）spi flash的分区个数（根据uboot的分区个数）
2）spi flash的分区（根据uboot的分区）
- spi flash的芯片支持 （芯片的型号，id等，在winbond.c中有这一款芯片的定义）
- 打开调试信息
Pr_dbg改为pr_err输出信息
在这个过程中会发现rootfs的大小给定的大小，解决方案如下
Make menuconfig
Uboot的mtdparts分区参数改为：
mtdparts=ltq_sflash:256k(uboot),64k(gphyfirmware),9792k(rootfs),4096k(data),2096k(kernel),64k(sysconfig),4k(ubootconfig),4k(dectconfig),8k(wlanconfig)
ltq_sflash:256k(uboot),64k(gphyfirmware),11840k(rootfs),2048k(data),2096k(kernel),64k(sysconfig),4k(ubootconfig),4k(dectconfig),8k(wlanconfig)
4）加完之后，追踪Linux ltq_sflash.c 与Makefile和内核的.Config的联系，发现有选项未打开。
Makefile
Config
在make kernel_menuconfig中选择
Device Drivers------->
SPI supportt ------>
- 编译内核 make target/linux/install V=s 成功之后tftp下载内核
- 打开SPI flash的读写[ 55.740000] ifx_spi_flash_read: (from = 0x00756e00, len = 512)
关闭这些打印信息，之后编译make
1. 配置gphy firmware
-> Device Drivers
-> Network device support (NETDEVICES [=y])
[*]PPA Acceleration Package
-> Device Drivers
-> Network device support (NETDEVICES [=y])
PPA Platform Selection
(X) xRX200
-> Device Drivers
-> Network device support (NETDEVICES [=y]
[*]PPA Acceleration Package - Kernel APIs
-> Device Drivers
-> Network device support (NETDEVICES [=y])
[*]Proc Filesystem Support for PPA API
-> Device Drivers
-> Network device support (NETDEVICES [=y])
[*]PPA Acceleration Package - Data Path Driver
-> Package Selection
[*]PPA D5 Package <MII0/1>
-> Device Drivers
-> Network device support (NETDEVICES [=y])
[*]LTQ_PPA_API_SW_FASTPATH
配置完后，可以在/lib/firmware下查看到有以下几个内核模块文件
ppa_api.ko
ppa_api_proc.ko
ppa_api_sw_acel_mod.ko
ppa_datapath_xrx200_d5.ko
ppa_hal_xrx200_d5.ko
移植udhcp server & client
make menuconfig
Base system
-> busybox
-> Configuration
-> Networking Utilities
-> udhcp client
-> udhcp server
DAS 2047
In insmod_main: can't insert ifx_timer_driver File exists at line:668!
root@192:~# [ifx_cleanup_hosts_tr69_instances:4727]
In Function [ifx_get_mgmt_server] : Error--> Failed to get URL !!
[ifx_cleanup_traceroute_tr69_instances:4438]
In Function [ifx_get_tr69_misc] : Error--> Failed to get AuthACS !!
In Function [ifx_get_tr69_misc] : Error--> Failed to get AuthACS !!
In Function [ifx_get_tr69_misc] : Error--> Failed to get AuthACS !!
The device /dev/mtd1 could not be opened
IFX_CWMP_AppInit:1421 [-15] Unable to get obj for Inform. rc.conf Corrupted!!
In Function [ifx_get_tr69_misc] : Error--> Failed to get AuthACS !!
In Function [ifx_get_tr69_auth] : Error--> Failed to get Realm !!
In Function [ifx_get_mgmt_server] : Error--> Failed to get URL !!
The device /dev/mtd1 could not be opened
In Function [ifx_get_tr69_misc] : Error--> Failed to get AuthACS !!
wait() Unblocked tPID=2047 PIDChld=2047 iStatus=2816 errno=2
PSD
PID USER VSZ STAT COMMAND
1 root 1660 S init
2 root 0 SW [kthreadd]
3 root 0 SW [ksoftirqd/0]
4 root 0 SW [kworker/0:0]
5 root 0 SW< [kworker/0:0H]
6 root 0 SW [kworker/u2:0]
7 root 0 SW< [khelper]
8 root 0 SW [kworker/u2:1]
152 root 0 SW< [writeback]
154 root 0 SW< [bioset]
156 root 0 SW< [kblockd]
162 root 0 SW< [ata_sff]
172 root 0 SW [khubd]
190 root 0 SW< [rpciod]
191 root 0 SW [kworker/0:1]
205 root 0 SW [kswapd0]
206 root 0 SW [fsnotify_mark]
207 root 0 SW< [nfsiod]
208 root 0 SW< [crypto]
360 root 0 SW< [deferwq]
363 root 0 SW [kworker/0:2]
365 root 0 SW< [kworker/0:1H]
392 root 0 SWN [jffs2_gcd_mtd3]
418 root 1120 S -sh
424 root 856 S swreset
476 root 872 S /usr/sbin/ppasessmgmtd
493 root 856 S /usr/bin/cgroup_notifier
495 root 872 S /usr/bin/cgroup_daemon
559 root 0 SW [el_handler]
597 root 1316 S syslog-ng -f /tmp/syslog-ng.conf
1093 root 1312 S /usr/sbin/devm 1
1241 root 880 S /usr/sbin/dwatch
1248 root 9068 S /usr/sbin/mini_httpd -C /etc/mini_httpd.conf -D
1401 root 0 SW [TAPIkpi_in]
1403 root 0 SW< [TAPIevents]
1421 root 0 SW [VMMCsysclk]
1522 root 0 SW [kworker/u2:2]
1765 root 0 SW< [pmcu_wq]
1781 root 1172 S /sbin/mountd
1873 root 3024 S stunnel
2120 root 1108 S /bin/sh -c ps -ef
2121 root 1660 R ps -ef
DAS 2122
把less关闭掉
*** {build_dir/linux-lantiq_xrx200_grx288_gw_he_ethwan_lte_sample/base-files/ipkg-lantiq/base-files/etc/rc.conf}
Make kernel_menuconfig
Machine selection --->
关闭了
[ ]PCIE Support
打开了
[*]XRX200 PHY firmware loader [*] Extra check fields on PHY firmware header