Messages in this thread | | | Date | Mon, 22 Jun 2009 16:11:47 +0200 | From | Pierre Ossman <> | Subject | Re: Speed of SDHCI subsystem |
| |
On Wed, 17 Jun 2009 23:45:50 +0200 "J.A. Magallón" <jamagallon@ono.com> wrote:
> > Thanks, now its clear it is related to hardware limits. > I suppose this controler is a cheap one... > Things in the Aspire One are these: >
*snip*
> 04:00.0 System peripheral: JMicron Technologies, Inc. SD/MMC Host Controller > 04:00.2 SD Host controller: JMicron Technologies, Inc. Standard SD Host Controller > 04:00.3 System peripheral: JMicron Technologies, Inc. MS Host Controller > 04:00.4 System peripheral: JMicron Technologies, Inc. xD Host Controller
That chip is capable of very high speeds but unfortunately the systems aren't always properly wired for it so the high-speed mode was disabled by default in the chips.
You can force it on by applying this patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a4b76193774b463b922cab2f92450efb20d29ef0;hp=d6d8de33415ca7598fe66d933b6556fa8f89afe2
Rgds -- -- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org rdesktop, core developer http://www.rdesktop.org TigerVNC, core developer http://www.tigervnc.org
WARNING: This correspondence is being monitored by the Swedish government. Make sure your server uses encryption for SMTP traffic and consider using PGP for end-to-end encryption. [unhandled content-type:application/pgp-signature] | |