[OpenWrt-Devel] RFT: Add support for kernel 5.4

[Adrian Schmutzler]

Hi,

> -----Original Message-----
> From: Stefan Lippers-Hollmann [mailto:s.l-h at gmx.de]
> Sent: Freitag, 28. Februar 2020 22:21
> To: John Crispin <john at phrozen.org>
> Cc: Adrian Schmutzler <mail at adrianschmutzler.de>; OpenWrt Development List
> <openwrt-devel at lists.openwrt.org>; Chuanhong Guo <gch981213 at gmail.com>;
> Koen Vandeputte <koen.vandeputte at ncentric.com>
> Subject: Re: [OpenWrt-Devel] RFT: Add support for kernel 5.4
> 
> Hi
> 
> On 2020-02-28, John Crispin wrote:
> > On 28.02.20 21:30, Stefan Lippers-Hollmann wrote:
> > > On 2020-02-28, mail at adrianschmutzler.de wrote:
> > >>> On 2020-02-28, Koen Vandeputte wrote:
> [...]
> > > ath79 with kernel 4.14 has already been (mostly) broken by "ath79: add
> > > new ar934x spi driver" (ebf0d8dadeca443121f4f597c51bf6591e341caf), which
> > > does break the (shared between all kernel versions) DTS definitions for
> > > NAND based ath79 devices (breaking compilation with kernel 4.14).
> > >
> > > Because of "FS#2524 - ath79-tiny: TP-Link TL-WR941ND v2.4: Marvel
> > > MV88E6060 regression between kernel v4.14 and v4.19"
> > > https://bugs.openwrt.org/index.php?do=details&task_id=2524 I still do
> > > regularly build ath79 with kernel 4.14, but in order to finish the build
> > > I do need to comment out the affected devices:
> [...]
> > >
> > > Admittedly, the affected TL-WR941ND v2 (4/32) is barely worth the effort
> > > anymore.
> [...]
> > sorry for being dense here. what are you trying to tell us ? is there a
> > bug for which you propose a patch or is this a report or just a rant ?
> > honestly cant figure it out
> 
> Neither, nor. It's merely a report that kernel 4.14 support (albeit
> technically present in source) for ath79 isn't functional anymore (and
> hasn't been for a few weeks) anyways, regardless of the introduction of
> kernel 5.4 and its changes to ag71xx. Kind of answering Adrian's previous
> question "By moving ag71xx to files-4.19 on ath79, I suspect 4.14 is broken
> now on this target."
> 
> Beyond that, I'm merely explaining why I'm still regularly looking at ath79
> with kernel 4.14 (because of the aforementioned regression in MV88E6060
> on top of kernel 4.19). While I still regularly build for this device and
> sometimes boot it up/ flash a fresh (kernel 4.14 based) build, I'm well
> aware that this device is far beyond its prime (4/32, buggy draft-n AR9103
> wireless) and don't actively use it anymore. Therefore I consider this
> flyspray bug more as a heads-up (while ath79 with MV88E6060 is rare, the
> underlying cause for this regression might have further impact), than in
> any way, shape or form 'important' - and I'd consider commenting out
> "tplink_tl-wr941-v2" (or removing its support altogether) a valid
> 'solution' (just retaining images for it in its current state in master is
> problematic, as they are broken and because the device requires serial
> access for recovering; no push-button tftp recovery provided by the OEM
> bootloader).
> 
> Regards
> 	Stefan Lippers-Hollmann

thanks for you detailed explanation.

Is there a specific reason why you build based on master and do not use the
19.07 stable branch with working 4.14 support?

Best

Adrian



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