LKML Archive on
help / color / mirror / Atom feed
From: "Daniel J Blueman" <>
To: "Chris Adams" <>
Cc: "Linux Kernel" <>
Subject: Re: ExpressCard hotswap support?
Date: Fri, 4 May 2007 11:04:31 +0100	[thread overview]
Message-ID: <> (raw)

On 4 May, 01:20, Chris Adams <> wrote:
> I've got a Thinkpad Z60m with an ExpressCard slot, and I got a Belkin
> F5U250 GigE ExpressCard (Marvell 88E8053 chip using sky2 driver).  It
> appears that Linux only recognizes it if I insert the card with the
> system powered off.  If I hot-insert the card, nothing happens (no
> messages logged, no PCI device shows up, nothing).

The BIOS initialises and powers up the downstream PCI express port
when it detects a card is present.

When Linux boots, it enumerates the bus and sees it, but does not do
prior configuration to enable, configure and cause link negotiation on
all PCI express ports I believe; this requires chipset and (sometimes
revision-) specific code, which wouldn't be so robust as the BIOS
doing the footwork.

I have the same problem on my Sony VGN-SZ240. The problem would be
addressed if the BIOS powered up all PCI express ports, but then this
would draw more power. Perhaps if just needs to do the hotplug
configuration correctly, but then older OSs may have problems?

> Does Linux support hotswapping ExpressCards?
> This is with Fedora Core 6 with all updates, kernel 2.6.20-1.2948.fc6.
Daniel J Blueman

             reply	other threads:[~2007-05-04 10:04 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-04 10:04 Daniel J Blueman [this message]
2007-05-05  1:52 ` Chris Adams
  -- strict thread matches above, loose matches on Subject: below --
2007-05-04  0:10 Chris Adams

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:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \
    --subject='Re: ExpressCard hotswap support?' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).