From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Arnd Bergmann <arnd@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
Arnd Bergmann <arnd@arndb.de>, Christoph Hellwig <hch@lst.de>,
Linus Walleij <linus.walleij@linaro.org>,
Marc Zyngier <maz@kernel.org>
Subject: Re: [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS
Date: Sun, 11 Sep 2022 20:53:13 +0100 [thread overview]
Message-ID: <Yx48qRzCYyg8Gick@shell.armlinux.org.uk> (raw)
In-Reply-To: <20220909205749.1793677-5-arnd@kernel.org>
On Fri, Sep 09, 2022 at 10:57:48PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The CONFIG_ISA option is only used for actual add-in cards, not
> on-board devices. NetWinder has no hardware support for those,
> and ebsa285 appears to not support them in Linux, as the XBUS
> is not set up that way and there is no support for a PCI-ISA
> bridge.
That is an incorrect assumption, but is still true as far as ISA
DMA is concerned.
The "Team" produced a PCI card with a PCI southbridge chip on, along
with ISAPNP devices. ISAPNP depends on CONFIG_ISA... That said, using
the "ESS ES1879 Plug and Play AudioDrive" on it requires ISA DMA, and
as DMA from the PCI southbridge causes the PCI bus to deadlock, it
probably doesn't matter.
However, what I'm pointing out is that the assertion that CONFIG_ISA
means ISA cards is not entirely correct with the creation of this
PCI southbridge card.
(This card gives me keyboard, mouse, serial etc ports which is its
main use in the machine.)
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-09-11 19:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-09 20:57 [PATCH v3 0/5] ARM: footbridge: cleanups Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 1/5] ARM: footbridge: remove addin mode Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 2/5] ARM: footbridge: remove leftover from personal-server Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 3/5] ARM: footbridge: move isa-dma support into footbridge Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 4/5] ARM: footbridge: limit CONFIG_ISA to CATS Arnd Bergmann
2022-09-11 19:53 ` Russell King (Oracle) [this message]
2022-09-15 14:00 ` Arnd Bergmann
2022-09-09 20:57 ` [PATCH v3 5/5] ARM: footbridge: remove custom DMA address handling Arnd Bergmann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Yx48qRzCYyg8Gick@shell.armlinux.org.uk \
--to=linux@armlinux.org.uk \
--cc=arnd@arndb.de \
--cc=arnd@kernel.org \
--cc=hch@lst.de \
--cc=linus.walleij@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=maz@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.