AR9285 art tool

With this tool you can tune a few parameters in the eeprom dump from the AR9285 wireless chips:

• Regulatory domain
• Capabilities

Tested with the "virtual" eeprom present in the Tplink WR741ND v2.4 router. The eeprom at this router lives in a partition called art

Example:
Backup the partition under Openwrt

root@OpenWrt:/# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00020000 00010000 "u-boot"
mtd1: 00104200 00010000 "kernel"
mtd2: 002cbe00 00010000 "rootfs"
mtd3: 000c0000 00010000 "rootfs_data"
mtd4: 00010000 00010000 "art"
mtd5: 003d0000 00010000 "firmware"
root@OpenWrt:/# 

root@OpenWrt:/# dd if=/dev/mtd4 of=/tmp/art.bin

Transfer art.bin to your computer, and hack it with the tool

[dani@tool ath9k_caldata]$ ./ar9285_art -i art.bin -o art-hacked.bin -r 255

Now transfer art-hacked.bin to your router, and write it to art partition

mtd write art-hacked.bin art

---

Note: The art partition must be writeable. As default it isn't in Openwrt, probably you will need to build a custom firmware with this code:

parts[3].name = "art";
parts[3].offset = art_offset;
parts[3].size = TPLINK_ART_LEN;
parts[3].mask_flags = MTD_WRITEABLE;

changed to

parts[3].name = "art";
parts[3].offset = art_offset;
parts[3].size = TPLINK_ART_LEN;
parts[3].mask_flags = 0;

at file:
./target/linux/ar71xx/files/drivers/mtd/tplinkpart.c