最近在搞高通的IPQ806X方案，路由网关和无线一体化设备。ARM-V7双核CPU，NAT和BRIDGE的内外网转发性能都只有30多K，为了优化，要改内核驱动。
首先面临的是OPENWRT升级问题，下面总结一下方法：
一、在UBOOT下升级
1、设置本地IP和TFT服务器IP
set autostart no && set ipaddr 10.0.2.151 && set serverip 10.0.2.153
2、加载
tftpboot 0x42000000 ipq806x-nor-apps.img
3、烧录
sf probe && imageaddr=0x42000000 &&source 0x42000000:script
二、在linux系统下升级
方法有:
1.dd
2.sysupgrade
这两种方法都是需要先将文件tftp到系统中。
例子1：
升级UBOOT
dd if=openwrt-ipq806x-u-boot.mbn of=/dev/mtdblock8
例子2：
升级内核和文件系统
sysupgrade -i -v ipq806x-nor-apps.img
输出示例：
root@OpenWrt:/tmp# sysupgrade -i -v ipq806x-nor-apps.img
Warning: optional section “sbl1” missing from “ipq806x-nor-apps.img”. Continue…
Warning: optional section “sbl2” missing from “ipq806x-nor-apps.img”. Continue…
Warning: optional section “sbl3” missing from “ipq806x-nor-apps.img”. Continue…
Warning: optional section “u-boot” missing from “ipq806x-nor-apps.img”. Continue…
Warning: optional section “ddr-ap148” missing from “ipq806x-nor-apps.img”. Continue…
Warning: optional section “ssd” missing from “ipq806x-nor-apps.img”. Continue…
Warning: optional section “tz” missing from “ipq806x-nor-apps.img”. Continue…
Warning: optional section “rpm” missing from “ipq806x-nor-apps.img”. Continue…
Returning 0 from is_authentication_check_enabled
Keep config files over reflash (Y/n): y
Edit config file list (y/N): n
Saving config files…
etc/sysctl.conf
etc/slp.spi
etc/slp.reg
etc/slp.conf
etc/shells
etc/rc.local
etc/profile
etc/passwd
etc/inittab
etc/hosts
etc/group
etc/fw_env.config
etc/firewall.user
etc/dropbear/dropbear_rsa_host_key
etc/dropbear/dropbear_dss_host_key
etc/cups/printers.conf
etc/cups/client.conf
etc/config/upnpd
etc/config/uhttpd
etc/config/ucitrack
etc/config/ubootenv
etc/config/thermal
etc/config/system
etc/config/samba
etc/config/rstp
etc/config/ripd
etc/config/radvd
etc/config/pure-ftpd
etc/config/pppoe
etc/config/nss
etc/config/network
etc/config/mcproxy
etc/config/macsec
etc/config/luci
etc/config/firewall
etc/config/dropbear
etc/config/dhcp6c
etc/config/dhcp
etc/config/ddns
etc/config/alljoyn
Sending TERM to remaining processes … syslogd klogd hotplug2 ubusd netifd mcproxy cupsd slpd zebra Jan 5 05:18:49 watchquagga[2535]: zebra state -F
watchquagga Jan 5 05:18:49 watchquagga[2535]: Terminating on signal
uhttpd dbus-daemon dnsmasq smbd nmbd xl2tpd avahi-daemon alljoyn-daemon rngd ntpd thermald
Sending KILL to remaining processes … uhttpd
Switching to ramdisk…
Performing system upgrade…
Section script ignored
ash: can’t create /sys/devices/platform/msm_nand/boot_layout: nonexistent directory
find: /sys/block/mmcblk*/: No such file or directory
Unlocking kernel …
Erasing kernel …
Writing from to kernel … [w]1845248+0 records in
1845248+0 records out
Flashed hlos-894c257106b4e407230bdc07bedb9c44ce088f40
ash: can’t create /sys/devices/platform/msm_nand/boot_layout: nonexistent directory
find: /sys/block/mmcblk*/: No such file or directory
Unlocking rootfs …
Erasing rootfs …
Writing from to rootfs … [w]16685056+0 records in
16685056+0 records out
Flashed fs-73be11f50c9325ae68c43b1ae01663c947d14314
[ 735.875945] refresh_rootfs_split: updating partition “rootfs_data”, offset: 0x1510000 (0x810000)
ash: can’t create /sys/devices/platform/msm_nand/boot_layout: nonexistent directory
Refreshing partitions
Refreshing mtd partition rootfs …
find: /sys/block/mmcblk*/: No such file or directory
Unlocking rootfs_data …
Erasing rootfs_data …
Appending /tmp/sysupgrade.tgz to jffs2 partition rootfs_data
Upgrade completed
Reboot (Y/n): y
Rebooting system…
[ 839.041330] Restarting system.
[ 839.043423] Going down for restart now