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Date:   Tue, 12 Feb 2019 12:39:00 +0800
From:   tomli@tomli.me
To:     Aaro Koskinen <aaro.koskinen@iki.fi>
Cc:     Alexandre Oliva <lxoliva@fsfla.org>, Tom Li <tomli@tomli.me>,
        James Hogan <jhogan@kernel.org>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        Huacai Chen <chenhc@lemote.com>,
        Ralf Baechle <ralf@linux-mips.org>, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC] On the Current Troubles of Mainlining Loongson Platform
 Drivers
Message-ID: <20190212043900.GA111884@x220>
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> >=20
> > That doesn't seem to explain even a quiet boot up taking several times
> > longer than 4.19, and package installation over an ethernet connection
> > (thus not using the console) also taking several times longer.
>=20
> Maybe it's a slow disk?
>=20
> ATA (libata) CS5536 driver is having issues with spurious IRQs and often
> disables IRQs completely during the boot. You should see a warning
> in dmesg. This was the reason for slowness on my FuLoong mini-PC. A
> workaround is to switch to old IDE driver.
>=20
> Discussion: https://lore.kernel.org/linux-mips/20190106124607.GK27785@dar=
kstar.musicnaut.iki.fi/
>=20
> A.

I find that this problem is odd. I've been using libata personally since 20=
14 and
never had any IRQ problem at all. How can the problem even occur at all? Pe=
rhaps
related to a rarely used kernel option that trigger it, or a bug in the PMO=
N boot
firmware? I don't know...

But I think some versions of the PMON boot firmware have odd bugs. I'm curr=
ently
using the PMON firmware built by an OpenBSD developer, but I cannot find th=
e link
anymore.

Tom Li

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