ramips: mt7621 novel art_block partition

[Piotr Dymacz]

Hi,

On 27.07.2020 03:30, Heppler, J. Scott wrote:
> I came onto a Trendnet TEW-827DRU Version 2 that is MT7621an with
> MT7615E x 2 wifi chips.  I was able to get UART output and stock has
> these partitions:
> 
> [    2.512000] 0x000000000000-0x000001000000 : "ALL"
> [    2.520000] 0x000000000000-0x000000030000 : "Bootloader"
> [    2.532000] 0x000000030000-0x000000040000 : "Config"
> [    2.544000] 0x000000040000-0x000000050000 : "Factory"
> [    2.552000] 0x000000050000-0x000000ef0000 : "firmware"
> [    2.564000] 0x000000050000-0x000000380000 : "kernel"
> [    2.576000] 0x000000380000-0x000000ef0000 : "rootfs"
> [    2.584000] 0x000000ef0000-0x000000ff0000 : "rootfs_data"
> [    2.596000] 0x000000ff0000-0x000001000000 : "art_block"
> 
> I reviewed all the mt7621 *dts files and none have an art_block.

grep -rn "art_block" target/linux/ramips/dts/

target/linux/ramips/dts/mt7621_elecom_wrc-1900gst.dts:31:		label = 
"art_block";
target/linux/ramips/dts/mt7621_elecom_wrc-2533gst.dts:30:		label = 
"art_block";
target/linux/ramips/dts/mt7621_elecom_wrc-1750gs.dts:31:		label = 
"art_block";

> My understanding is that for Qualcomm, the art* partition contains
> Atheros calibration data. I'm lost as to what and art_block is on a
> mediatek device.  Trendnet can be lazy with partition naming - the
> TEW-810 has a partion referred to a D-Link.

Does this partition contain any data or is empty? I suppose you can just 
ignore it (keep it as read-only), it looks like copy&paste mistake made 
by original board manufacturer.

-- 
Cheers,
Piotr

> I did find a "firmware2" partition -
> mt7621_asus_rt-acx5p.dtsi, a "second_config" - mt7621_mtc_wr1201.dts
> that are about the same size and position.
> 
> 
> Are there any Mediatek experts that can enlighten me and point me in the
> right direction?
> 
> Thanks in advance
>