From: Albert ARIBAUD <albert.aribaud@free.fr>
To: u-boot@lists.denx.de
Subject: [U-Boot] ELF_RELOC causes strange I-cache issues
Date: Thu, 21 Oct 2010 12:34:01 +0200 [thread overview]
Message-ID: <4CC01719.30706@free.fr> (raw)
In-Reply-To: <4CC011B4.9060808@emk-elektronik.de>
Le 21/10/2010 12:11, Reinhard Meyer a ?crit :
> Hello,
>
> observation here:
>
> ICACHE is always ON. No crash with "usb read 21000000 0 1000"
> Sorry that I can't reproduce the problem here, not even with 10000 blocks.
> (tried a few dozen times)
> (ARM926EJS - AT91SAM9XE)
> (based on TOT 3ed16071b006dbda65070a4143db74da469f6e30 of 35h ago)
>
> 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.
And I suggest we move this dcache issue to its own discussion thread.
Amicalement,
--
Albert.
next prev parent reply other threads:[~2010-10-21 10:34 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 [this message]
2010-10-21 10:49 ` Reinhard Meyer
2010-10-21 10:50 ` Heiko Schocher
2010-10-21 11:03 ` Stefan Roese
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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