From: Stefan Roese <sr@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] ELF_RELOC causes strange I-cache issues
Date: Thu, 21 Oct 2010 13:03:16 +0200 [thread overview]
Message-ID: <201010211303.16760.sr@denx.de> (raw)
In-Reply-To: <4CC01719.30706@free.fr>
On Thursday 21 October 2010 12:34:01 Albert ARIBAUD wrote:
> > But with DCACHE ON, the USB Stick is not found - maybe a timing problem:
> >
> > TOP9000> dc off
> > Data (writethrough) Cache is OFF
> > TOP9000> usb reset
> > (Re)start USB...
> > USB: scanning bus for devices... 2 USB Device(s) found
> >
> > scanning bus for storage devices... 1 Storage Device(s) found
> >
> > TOP9000> dc on
> > Data (writethrough) Cache is ON
> > TOP9000> usb reset
> > (Re)start USB...
> > USB: scanning bus for devices... ERROR: CTL:TIMEOUT
> > 2 USB Device(s) found
> >
> > scanning bus for storage devices... 0 Storage Device(s) found
> >
> > TOP9000>
> >
> >
> > Reinhard
>
> If the USB controller uses DMA, then the DCache issue probably has to do
> with making sure to flush the (relevant lines of) cache before
> memory-to-device DMAs and to invalidate the (again, relevant lines of)
> cache after device-to-memory DMAs.
Correct. Note that the EHCI driver already supports such a mode with d-cache
enabled. You need to set CONFIG_EHCI_DCACHE to enable these cache handling
functions.
> And I suggest we move this dcache issue to its own discussion thread.
Yes. This should be analysed/handled independently.
Cheers,
Stefan
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de
next prev parent reply other threads:[~2010-10-21 11:03 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-20 18:49 [U-Boot] ELF_RELOC causes strange I-cache issues Wolfgang Denk
2010-10-20 20:12 ` Albert ARIBAUD
2010-10-20 20:54 ` Wolfgang Denk
2010-10-20 22:20 ` Joakim Tjernlund
2010-10-21 9:18 ` Albert Aribaud
2010-10-21 9:51 ` Heiko Schocher
2010-10-21 10:11 ` Reinhard Meyer
2010-10-21 10:34 ` Albert ARIBAUD
2010-10-21 10:49 ` Reinhard Meyer
2010-10-21 10:50 ` Heiko Schocher
2010-10-21 11:03 ` Stefan Roese [this message]
2010-10-21 10:54 ` Wolfgang Denk
2010-10-21 10:56 ` Albert ARIBAUD
2010-10-21 11:36 ` Wolfgang Denk
2010-10-21 11:45 ` Wolfgang Denk
2010-10-21 11:52 ` Stefano Babic
2010-10-21 11:53 ` Wolfgang Denk
2010-10-21 12:00 ` Wolfgang Denk
2010-10-21 12:53 ` Albert ARIBAUD
2010-10-21 11:28 ` Joakim Tjernlund
2010-10-21 10:05 ` Wolfgang Denk
2010-10-22 12:23 ` [U-Boot] [PATCH] ehci-hcd.c: fix hanging under higher load Wolfgang Denk
2010-10-22 19:51 ` Remy Bohmer
2010-10-22 12:26 ` [U-Boot] ELF_RELOC causes strange I-cache issues Wolfgang Denk
2010-10-22 13:19 ` Albert ARIBAUD
2010-10-22 13:28 ` Wolfgang Denk
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