linux-kernel - Re: [PATCH 3/5] MIPS: Loongson64: Enlarge IO_SPACE

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Date:   Mon, 20 Jul 2020 14:20:46 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Frank Rowand <frowand.list@...il.com>,
        Paul Burton <paulburton@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        DTML <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] MIPS: Loongson64: Enlarge IO_SPACE_LIMIT

On Mon, Jul 20, 2020 at 2:07 PM Jiaxun Yang <jiaxun.yang@...goat.com> wrote:
> 在 2020/7/20 下午6:45, Arnd Bergmann 写道:
> > On Mon, Jul 20, 2020 at 9:44 AM Jiaxun Yang <jiaxun.yang@...goat.com> wrote:
> >> It can be very big on LS7A PCH systems.
> > In practice, one should rarely need more than a few kb worth of
> > port numbers, unless you expect to see hundreds of legacy PCI
> > devices.
> I must blame stupid hardware design here. The LPC Controller (for ISA
> device) can eat
> up to 0x20000 IO BAR, and we can't resize it. Thus we have to enlarge
> the I/O Space.

Ok, I see.

       Arnd