linux-kernel - Re: 3.19 on Nokia n900: audio quality awful

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Message-ID: <20150106222717.GC6071@fuloong-minipc.musicnaut.iki.fi>
Date:	Wed, 7 Jan 2015 00:27:17 +0200
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	Pavel Machek <pavel@....cz>
Cc:	Felipe Balbi <balbi@...com>, pali.rohar@...il.com, sre@...ian.org,
	sre@...g0.de, kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	ivo.g.dimitrov.75@...il.com
Subject: Re: 3.19 on Nokia n900: audio quality awful

On Tue, Jan 06, 2015 at 11:08:05PM +0100, Pavel Machek wrote:
> On Tue 2015-01-06 22:57:30, Aaro Koskinen wrote:
> > Hi,
> > 
> > On Tue, Jan 06, 2015 at 09:50:00PM +0100, Pavel Machek wrote:
> > > PS: Unfortunately, N900 will not boot using nfsroot in 3.16+ at least,
> > > and boot from MMC card is broken and has been for quite some time.
> > 
> > USB networking works fine with 3.19-rc3 and also MMC card rootfs.
> 
> Does nfsroot work for you? USB networking works as a module but not
> build-in. [Patch is available for this one.]
> 
> u-SD card seems to have similar problem. If I try it after boot, I can
> access it ok, but using u-SD card for rootfs fails. If it works for
> you, it would be interesting to know.

I haven't tried nfsroot, but I've been using USB networking for ssh
for a couple of years without issues. I have g_ether as module.

Also I recently switched rootfs to u-SD card, and it (MMC) works fine
as builtin.

But I'm mounting it from userspace (using builtin initramfs inside
zImage), with a poll loop that waits for a device to appear. Maybe if you
do it from kernel you need to use root wait/delay etc. options?

> I'm loading zImage using 0xffff directly from the PC.

Same here.

A.
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