小米路由系统启动过程 - 版本历史

Comcat：/* 内核启动参数 */

2014-06-04T07:03:03Z

‎内核启动参数

Comcat：/* 最终文件系统结构 */

2014-06-02T12:02:51Z

‎最终文件系统结构

Comcat：/* 最终文件系统结构 */

2014-06-02T12:02:33Z

‎最终文件系统结构

Comcat：/* /lib/preinit.sh */

2014-06-02T11:59:23Z

‎/lib/preinit.sh

Comcat：/* /lib/preinit.sh */

2014-06-02T11:51:44Z

‎/lib/preinit.sh

Comcat：/* /lib/preinit.sh */

2014-06-02T11:50:10Z

‎/lib/preinit.sh

Comcat：/* /init 启动脚本 */

2014-06-02T11:49:19Z

‎/init 启动脚本

Comcat：/* /init 启动脚本 */

2014-06-02T11:44:16Z

‎/init 启动脚本

Comcat：/* /init 启动脚本 */

2014-06-02T11:43:03Z

‎/init 启动脚本

Comcat：以“== Bootloader == Broadcom 出的片子，一直用自己的 Bootloader，叫 CFE，全称 Common Firmware Environment 原来写过一个 CFE Quick Start，在这...”为内容创建页面

2014-06-02T11:41:40Z

以“== Bootloader == Broadcom 出的片子，一直用自己的 Bootloader，叫 CFE，全称 Common Firmware Environment 原来写过一个 CFE Quick Start，在这...”为内容创建页面

新页面

== Bootloader ==

Broadcom 出的片子，一直用自己的 Bootloader，叫 CFE，全称 Common Firmware Environment

原来写过一个 CFE Quick Start，在这：http://www.jackslab.org/?portfolio=cfe-quick-start

小米路由系统 0.5.41 的 CFE 启动过程：

<source lang=bash>
CFE version v1.0.4
BSP: 6.37.14.34 (r415984) based on BBP 1.0.37 for BCM947XX (32bit,SP,)
Build Date: Wed Apr 30 18:03:21 CST 2014 (szy@shenzhiyong-ct)
Copyright (C) 2000-2008 Broadcom Corporation.

Init Arena
Init Devs.
Boot up from NOR flash...
Boot partition size = 262144(0x40000)
Can't find nandflash! ccrev = 42, chipst= 0
DDR Clock: 800 MHz
Info: DDR frequency set from clkfreq=1000,*800*
et0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 6.37.14.34 (r415984)
CPU type 0x0: 1000MHz
Tot mem: 262144 KBytes

CFE mem: 0x00F00000 - 0x0179FE38 (9043512)
Data: 0x00F58390 - 0x00F588C8 (1336)
BSS: 0x00F588D8 - 0x00F9DE38 (284000)
Heap: 0x00F9DE38 - 0x0179DE38 (8388608)
Stack: 0x0179DE38 - 0x0179FE38 (8192)
Text: 0x00F00000 - 0x00F4CCC4 (314564)
Boot: 0x017A0000 - 0x017E0000
Reloc: I:00000000 - D:00000000

Device eth0: hwaddr 8C-BE-BE-20-B7-48, ipaddr 192.168.1.1, mask 255.255.255.0
gateway not set, nameserver not set
bootargs: boot -raw -z -addr=0x8000 -max=0xef8000 flash0.os:
Loader:raw Filesys:raw Dev:flash0.os File: Options:(null)
Loading: ..... 5372256 bytes read
Entry at 0x00008000
Closing network.
Starting program at 0x00008000
</source>

可以看到其启动后，直接加载 flash0.os 分区（/dev/mtdblock2 名为 'os'）的 raw 格式的内核文件到地址 0x8000 处，然后直接跳转到这个地址开始执行

 

== 内核启动参数 ==

<source lang=bash>
# cat /proc/cmdline
root=/dev/ram rw console=ttyS0,115200 init=/init libata.force=3.0Gbps earlyprintk debug
</source>

从这可以看到，内核启动时首先挂载的是一个 initrd/initramfs 内存文件系统，执行的第一个程序是 /init 这个脚本

 

== /init 启动脚本 ==

<source lang=bash>
#!/bin/sh
# Copyright (C) 2006-2012 OpenWrt.org
#
#

klogger(){
local msg="$@"
test -z "$msg" && return 1

echo "$msg" >> /dev/kmsg 2>/dev/null
}

usb_check_for_rescure(){
local gpiobtn

gpiobtn=`cat /proc/xiaoqiang/reset`
rst=`gpio $gpiobtn | awk '{print $3}'`
if [ "$rst" = "<0>" ]; then
nvram set flag_reboot_system=2
exec /sbin/init
fi
}

getmtdblockdevbyname(){
local name
name="$1"
test -z "$name" && return 1
devnum=$(cat /proc/mtd | awk "/\"$name\"/"| awk -F':' '{print $1}' | awk -F'mtd' '{print $2}')
test -z "$devnum" && return 1
if [ -e "/dev/mtdblock${devnum}" ]
then
echo "/dev/mtdblock${devnum}"
return 0
else
return 1
fi
}

reboot() {
nvram set flag_reboot_system=1
exec /sbin/init
}

updone() {
nvram set flag_package_update=0
nvram set telnet_en=1
nvram commit

klogger "Update successfully!!! Reboot the System..."
reboot
}

upnet() {
#not vlan support in bootloader and ramfs, using trunk mode
#set to "0 1 2 5u" for ramfs network only, do not commit
rmmod et 2>/dev/null
nvram set vlan1ports="0 2 5u"
nvram set vlan2ports="4 5"

mac=`nvram get et0macaddr`
if [ "$mac" = "00:90:4C:0F:F2:a7" ]; then
uuid=`cat /proc/sys/kernel/random/uuid`
b1=`echo $uuid | cut -b 1-2`
b2=`echo $uuid | cut -b 3-4`
b3=`echo $uuid | cut -b 5-6`
mac=`echo 00:90:4C:$b1:$b2:$b3`
nvram set "pci/1/1/macaddr=$mac"

uuid=`cat /proc/sys/kernel/random/uuid`
b1=`echo $uuid | cut -b 1-2`
b2=`echo $uuid | cut -b 3-4`
b3=`echo $uuid | cut -b 5-6`
mac=`echo 00:90:4C:$b1:$b2:$b3`
nvram set "pci/2/1/macaddr=$mac"

uuid=`cat /proc/sys/kernel/random/uuid`
b1=`echo $uuid | cut -b 1-2`
b2=`echo $uuid | cut -b 3-4`
b3=`echo $uuid | cut -b 5-6`
mac=`echo 00:90:4C:$b1:$b2:$b3`
nvram set "et0macaddr=$mac"
fi
insmod /lib/modules/et.ko

lip=`nvram get flag_local_ip`
if [ "$lip" = "auto" ]; then
/sbin/udhcpc -t 10 -n
if [ $? -eq 1 ]; then
lip="192.168.31.1"

ifconfig eth0 $lip up
fi
else
[ -n "$lip" ] || lip="192.168.31.1"
ifconfig eth0 $lip up
fi
echo 1 > /proc/sys/net/ipv6/conf/eth0/forwarding

ifconfig lo up
nvram set vlan1ports="0 2 5*"
nvram set vlan2ports="4 5"
}

uperror() {
klogger "SQUASHFS Filesystem Error!!!"
klogger "Switch to RAMFS..."

upnet
exec /sbin/init
}

squashfs() {
klogger "Switch to SQUASHFS..."

# gpio 1 1
# gpio 3 1
# gpio 2 0

# red led is error
#move red light to boot_check
#gpio 1 0

# nvram set flag_boot_type=2
reboot

rescuerootdev=$(getmtdblockdevbyname squashfs)
if [ -n "$rescuerootdev" ]
then
mount -t squashfs $rescuerootdev /mnt
if [ $? -ne 0 ]
then
klogger "ERROR: mount -t squashfs $rescuerootdev /mnt failed."
else
# boot_status: 1 sata mode
# 2 flash mode
echo 2 > /sys/power/boot_status
upmount
if [ -x /mnt/etc/rescueinit ]
then
klogger "switch to rescue system($rescuerootdev) by /etc/rescueinit ..."
exec switch_root /mnt /etc/rescueinit
fi
if [ -x /mnt/lib/preinit.sh ]
then
klogger "switch to rescue system($rescuerootdev) by /lib/preinit.sh ..."
exec switch_root /mnt /lib/preinit.sh
fi
umount -f $rescuerootdev
fi
fi
uperror
}

upmount() {
mount -n -o move /tmp /mnt/tmp
mount -n -o move /sys /mnt/sys
mount -n -o move /proc /mnt/proc
mount -n -o move /dev /mnt/dev
}

[ -d /dev ] || mkdir -m 0755 /dev
[ -d /mnt ] || mkdir -m 0700 /mnt
[ -d /sys ] || mkdir /sys
[ -d /proc ] || mkdir /proc
[ -d /tmp ] || mkdir /tmp

mkdir -p /var/lock
mount -t sysfs -o nodev,noexec,nosuid none /sys
mount -t proc -o nodev,noexec,nosuid none /proc

klogger "Loading, please wait..."

# Note that this only becomes /dev on the real filesystem if udev's scripts
# are used; which they will be, but it's worth pointing out
if ! mount -t devtmpfs -o mode=0755 none /dev; then
mount -t tmpfs -o mode=0755 none /dev
mknod -m 0600 /dev/console c 5 1
mknod /dev/null c 1 3
fi
mount -t tmpfs -o "nosuid,size=20%,mode=0755" tmpfs /tmp

klogger "Loading essential drivers..."
flag_usb_rootdisk_enable="$(nvram get flag_usb_rootdisk_enable)"
for i in `cat /lib/modules/mod.lst`;
do
[ "$i" = "usb-storage.ko" -a "$flag_usb_rootdisk_enable" != 'true' ] && continue
if [ "$i" != "et.ko" ] ; then
insmod /lib/modules/$i || nvram set flag_package_update=5
fi
done

# Check for USB rescure
klogger "Check for USB rescure..."
usb_check_for_rescure

model=`nvram get model`
if [ -z "$model" ]; then
model=`cat /proc/xiaoqiang/model`
fi

if [ "$model" = "R1AC" ]; then
insmod /lib/modules/usb-storage.ko 2>/dev/null
sleep 3
fi

#support tftpboot from network
if [ "$(nvram get flag_tftp_bootup)" = 'on' -a "$(nvram get flag_tftp_booted)" = 'true' ]
then
. /tftpboot.init
tftpboot_mount_rootfs
fi

klogger "Press Ctrl+C to enter RAMFS..."
rd -w 1 && nvram set flag_package_update=5

if [ ! -b /dev/sda ]; then
klogger "Warning: No Hard Disk"

nvram set flag_no_hdd=1
nvram commit

squashfs
fi

update=`nvram get flag_package_update`
ft_mode=`cat /sys/power/ft_mode`
if [ -n "$update" -a "$update" != "0" ]; then
#

klogger "Prepare the system to update..."
upnet

if [ $update = "5" ]; then
exec /sbin/init
else
/usr/sbin/autofd
if [ $? -eq 1 ]; then
gpio 2 1
gpio 3 1
gpio 1 0

if [ "$ft_mode" = "1" ]; then
exec /sbin/init
else
while true
do
/usr/sbin/update
retcode=$?

[ $retcode -eq 2 ] && exec /sbin/init
[ $retcode -eq 0 ] && updone
done
fi
else
updone
fi
fi
else
klogger "Bringup the system..."

#gpio 1 1
#gpio 2 1
#gpio 3 1

flag_try_sys1=`nvram get flag_try_sys1_failed`
flag_try_sys2=`nvram get flag_try_sys2_failed`

if [ "$flag_try_sys1" != "1" ] || [ "$flag_try_sys2" != "1" ]; then
# default: rootfs1
flag=`nvram get flag_boot_rootfs`
if [ "$flag" = "1" ]; then
mntdev=/dev/sda2
else
mntdev=/dev/sda1
fi
[ -b $mntdev ] && mount -o ro $mntdev /mnt

# flag_boot_type: 1 system in SATA version
# 2 system in SQUASH version
# 9 system in tftp version
nvram set flag_boot_type=1
if [ -x /mnt/lib/preinit.sh ]; then
# boot_status: 1 sata mode
# 2 flash mode
upmount
exec switch_root /mnt /lib/preinit.sh
else
if [ "$ft_mode" = "1" ]; then
# skip failed flag setting in FT mode
reboot
else
if [ "$flag" = "1" ]; then
nvram set flag_try_sys2_failed=1
else
nvram set flag_try_sys1_failed=1
fi
nvram set flag_ota_reboot=0
nvram commit

reboot
fi
fi
fi

# reset all failed flag in FT mode
if [ "$ft_mode" = "1" ]; then
nvram set flag_try_sys1_failed=0
nvram set flag_try_sys2_failed=0
nvram commit

reboot
fi

squashfs
fi
</source>

@@ 第54行： / 第54行： @@
 </source>
-从这可以看到，内核启动时首先挂载的是一个 initrd/initramfs 内存文件系统，执行的第一个程序是 /init 这个脚本
+从这可以看到，内核启动时首先挂载的是一个 initramfs 内存文件系统，执行的第一个程序是 /init 这个脚本
 <br><br>

@@ 第461行： / 第461行： @@
 <source lang=bash>
 /dev/sda1 on / type ext4 (ro,relatime,barrier=1,data=ordered)
 /dev/sda3 on /data type ext4 (rw,noatime,barrier=1,data=ordered)

@@ 第441行： / 第441行： @@
 文件 lib/preinit/42_format_ext_part 显示：
    /dev/sda3 挂载到 /data
    /dev/sda4 挂载到 /userdisk
@@ 第455行： / 第457行： @@
 同时当用户在 web 管理界面里格式化磁盘时，实际格式化的是 /dev/sda3 和 /dev/sda4，格式化完了后，其会将 /dev/sda1/etc 同步到 /dev/sda3/etc
 <br><br>
 <br><br>

@@ 第434行： / 第434行： @@
 </source>
-/dev/sda2/etc 是 'mount --bind' 到 /etc 下的
 <br><br>

@@ 第419行： / 第419行： @@
 ulimit -Hn 50000
 ulimit -Sn 50000
 </source>

←上一版本		2014年6月2日 (一) 11:50的版本
第372行：		第372行：

	== /lib/preinit.sh ==		== /lib/preinit.sh ==
		+
		+	<source lang=bash>
		+	#!/bin/sh
		+	# Copyright (C) 2006 OpenWrt.org
		+	# Copyright (C) 2010 Vertical Communications
		+
		+	export PATH=/bin:/sbin:/usr/bin:/usr/sbin
		+
		+	pi_ifname=
		+	pi_ip=192.168.31.1
		+	pi_broadcast=192.168.31.255
		+	pi_netmask=255.255.255.0
		+
		+	fs_failsafe_ifname=
		+	fs_failsafe_ip=192.168.31.1
		+	fs_failsafe_broadcast=192.168.31.255
		+	fs_failsafe_netmask=255.255.255.0
		+
		+	fs_failsafe_wait_timeout=2
		+
		+	pi_suppress_stderr=
		+	pi_init_suppress_stderr=
		+	pi_init_path="/bin:/sbin:/usr/bin:/usr/sbin"
		+	pi_init_cmd="/sbin/init"
		+
		+	. /lib/functions.sh
		+	. /lib/functions/boot.sh
		+
		+	boot_hook_init preinit_essential
		+	boot_hook_init preinit_main
		+	boot_hook_init failsafe
		+	boot_hook_init initramfs
		+	boot_hook_init preinit_mount_root
		+
		+	for pi_source_file in /lib/preinit/*; do
		+	. $pi_source_file
		+	done
		+
		+	boot_run_hook preinit_essential
		+
		+	pi_jffs2_mount_success=false
		+	pi_failsafe_net_message=false
		+
		+	boot_run_hook preinit_main
		+
		+	ulimit -Hn 50000
		+	ulimit -Sn 50000
		+	</source>

	/dev/sda2/etc 是 'mount --bind' 到 /etc 下的		/dev/sda2/etc 是 'mount --bind' 到 /etc 下的

@@ 第311行： / 第311行： @@
 else
          klogger "Bringup the system..."
          flag_try_sys1=`nvram get flag_try_sys1_failed`

←上一版本		2014年6月2日 (一) 11:43的版本
第175行：		第175行：
	klogger "Switch to SQUASHFS..."		klogger "Switch to SQUASHFS..."

−	~~# gpio 1 1~~
−	~~# gpio 3 1~~
−	~~# gpio 2 0~~
−
−	~~# red led is error~~
−	~~#move red light to boot_check~~
−	~~#gpio 1 0~~
−
−	~~# nvram set flag_boot_type=2~~
	reboot		reboot