On Tuesday 22 November 2016 16:22:57 Michal Kazior wrote: > On 21 November 2016 at 16:51, Pali Rohár <pali.rohar@xxxxxxxxx> wrote: > > On Friday 11 November 2016 18:20:50 Pali Rohár wrote: > >> Hi! I will open discussion about mac address and calibration data for > >> wl1251 wireless chip again... > >> > >> Problem: Mac address & calibration data for wl1251 chip on Nokia N900 > >> are stored on second nand partition (mtd1) in special proprietary format > >> which is used only for Nokia N900 (probably on N8x0 and N9 too). > >> Wireless driver wl1251.ko cannot work without mac address and > >> calibration data. > > Same problem applies to some ath9k/ath10k supported routers. Some even > carry mac address as implicit offset from ethernet mac address. As far > as I understand OpenWRT cooks cal blobs on first boot prior to loading > modules. So... wl1251 on Nokia N900 is not alone and this problem is there for more drivers and devices. Which means we should come up with some generic solution. > >> Absence of mac address cause that driver generates random mac address at > >> every kernel boot which has couple of problems (unstable identifier of > >> wireless device due to udev permanent storage rules; unpredictable > >> behaviour for dhcp mac address assignment, mac address filtering, ...). > >> > >> Currently there is no way to set (permanent) mac address for network > >> interface from userspace. And it does not make sense to implement in > >> linux kernel large parser for proprietary format of second nand > >> partition where is mac address stored only for one device -- Nokia N900. > >> > >> Driver wl1251.ko loads calibration data via request_firmware() for file > >> wl1251-nvs.bin. There are some "example" calibration file in linux- > >> firmware repository, but it is not suitable for normal usage as real > >> calibration data are per-device specific. > > You could hook up a script that cooks up the cal/mac file via > modprobe's install hook, no? Via modprobe hook I can either pass custom module parameter or call any other system (shell) commands. As wl1251.ko does not accept mac_address as module parameter, such modprobe hook does not help -- as there is absolutely no way from userspace to set or change (permanent) mac address. -- Pali Rohár pali.rohar@xxxxxxxxx
