From: Heiko Schocher <hs@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] ELF_RELOC causes strange I-cache issues
Date: Thu, 21 Oct 2010 12:50:01 +0200 [thread overview]
Message-ID: <4CC01AD9.60207@denx.de> (raw)
In-Reply-To: <4CC01719.30706@free.fr>
Hello Albert,
Albert ARIBAUD wrote:
> 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.
Yep. I think if you want to use dcache here, you have to activate
CONFIG_EHCI_DCACHE and implement the flush_dcache_range(),
invalidate_dcache_range(), flush_invalidate() functions for
your plattform, if not implemented yet.
> And I suggest we move this dcache issue to its own discussion thread.
Yep.
bye,
Heiko
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
next prev parent reply other threads:[~2010-10-21 10:50 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 [this message]
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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