ramips: mt7621 novel art_block partition

[mail at adrianschmutzler.de]

Hi,

> -----Original Message-----
> From: openwrt-devel [mailto:openwrt-devel-bounces at lists.openwrt.org]
> On Behalf Of Piotr Dymacz
> Sent: Montag, 27. Juli 2020 09:53
> To: Heppler, J. Scott <shep971 at centurylink.net>; openwrt-
> devel at openwrt.org
> Subject: Re: ramips: mt7621 novel art_block partition
> 
> 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";

Note that there might also be several cases where a partition labelled "art_block" has just been renamed to "art" for consistency within OpenWrt.

Best

Adrian

> 
> > 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
> >
> 
> 
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