网址：
https://wiki.openwrt.org/toh/raspberry_pi_foundation/raspberry_pi
Supported Versions
The Raspberry Pi is supported in the brcm2708 target.
Subtargets are bcm2708 for Raspberry Pi 1, bcm2709 for the Raspberry Pi 2, bcm2710 for the Raspberry Pi 3.
Raspberry Pi Zero is not currently supported by any release, but bcm2708 subtarget compiled from a later trunk seems to work.
Releases with support for Raspberry Pi are:
2016-04-01 Trunk r49103 adds Pi 3 WiFi firmware https://dev.openwrt.org/changeset/49103
2016-03-08 Trunk r48967 adds support for Raspberry Pi 3 https://dev.openwrt.org/changeset/48967
2016-03-15 15.05.1 Chaos Calmer Raspberry Pi 1: http://downloads.openwrt.org/chaos_calmer/15.05.1/brcm2708/bcm2708/
Raspberry Pi 2: http://downloads.openwrt.org/chaos_calmer/15.05.1/brcm2708/bcm2709/
2015-09-11 15.05 Chaos Calmer Raspberry Pi 1: http://downloads.openwrt.org/chaos_calmer/15.05/brcm2708/bcm2708/
Raspberry Pi 2: http://downloads.openwrt.org/chaos_calmer/15.05/brcm2708/bcm2709/
2015-02-10 Trunk r44403 - Add support for Raspberry Pi 2 / brcm2709 / 2836 https://dev.openwrt.org/changeset/44403
2014-10-02 14.07 Barrier Breaker http://downloads.openwrt.org/barrier_breaker/14.07/brcm2708/generic/
2013-04-25 12.09 Attitude Adjustment http://downloads.openwrt.org/attitude_adjustment/12.09/brcm2708/generic/
2012-07-24 Trunk r32825 - Add support for Raspberry Pi / brcm2708 / 2835 https://dev.openwrt.org/changeset/32825
If you are not sure which file to get, download: