From: Albert ARIBAUD <albert.aribaud@free.fr>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 1/9] arm926ej-s: Invalidate instruction cache in flush_cache
Date: Sun, 20 Mar 2011 09:18:45 +0100 [thread overview]
Message-ID: <4D85B865.3020305@free.fr> (raw)
In-Reply-To: <AANLkTi=bH50yuBq_2J8n=Nu7N0i=LLVMTR2=vHjC=fuQ@mail.gmail.com>
Le 03/20/11 06:36, arden jay a ?crit :
> Hi Michael,
>
> I still have question. :)
>
> When ARM fetch instruction, it firstly try cache.
> It then should have cache miss, and forces to reload the instruction
> from memory?
> Why it will have problem while U-boot& Kernel at the same memory location?
The error in your assumption is the "it then should have cache miss". A
cache won't have a cache miss if it has already been fetched and not yet
been invalidated, and the i-cache won't magically invalidate just
because you do data writes at the location where the i-cache was fetched
from; you end up with an i-cache that pretends to be valid but no longer
matches the main memory content.
Amicalement,
--
Albert.
next prev parent reply other threads:[~2011-03-20 8:18 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-17 19:46 [U-Boot] [PATCH 0/9] TS-7800 port for U-Boot Michael Spang
2011-03-17 19:46 ` [U-Boot] [PATCH 1/9] arm926ej-s: Invalidate instruction cache in flush_cache Michael Spang
2011-03-20 2:30 ` arden jay
2011-03-20 3:44 ` Michael Spang
2011-03-20 5:36 ` arden jay
2011-03-20 8:18 ` Albert ARIBAUD [this message]
2011-03-20 14:14 ` arden jay
2011-03-20 18:26 ` Michael Spang
2011-03-21 5:44 ` Aneesh V
2011-03-21 14:14 ` arden jay
2013-07-29 7:19 ` Albert ARIBAUD
2013-07-29 12:57 ` Michael Spang
2013-07-29 14:09 ` Albert ARIBAUD
2013-07-29 14:22 ` Michael Spang
2011-03-17 19:46 ` [U-Boot] [PATCH 2/9] mvgbe: Support preserving the existing MAC address Michael Spang
2011-04-24 23:50 ` Wolfgang Denk
2011-04-25 11:37 ` Tabi Timur-B04825
2011-04-26 4:23 ` Michael Spang
2011-04-30 4:17 ` Mike Frysinger
2011-04-30 14:34 ` Tabi Timur-B04825
2011-05-01 5:40 ` Mike Frysinger
2011-04-26 4:20 ` Michael Spang
2011-04-30 4:21 ` Mike Frysinger
2011-03-17 19:46 ` [U-Boot] [PATCH 3/9] orion5x: Increase maximum bank size to 128M Michael Spang
2011-03-17 19:46 ` [U-Boot] [PATCH 4/9] orion5x: Fix wrong address in orion5x_sdram_bar Michael Spang
2011-03-17 19:46 ` [U-Boot] [PATCH 5/9] ARM: Rename CONFIG_SKIP_LOWLEVEL_INIT to CONFIG_SKIP_CPU_INIT_CRIT Michael Spang
2011-04-24 23:53 ` Wolfgang Denk
2011-04-26 3:44 ` Michael Spang
2011-03-17 19:47 ` [U-Boot] [PATCH 6/9] ARM: Implement CONFIG_SKIP_LOWLEVEL_INIT for arm926ej-s Michael Spang
2011-04-24 23:55 ` Wolfgang Denk
2011-04-25 7:30 ` Albert ARIBAUD
2011-04-26 4:44 ` Michael Spang
2011-03-17 19:47 ` [U-Boot] [PATCH 7/9] Add board support for TS-7800 Michael Spang
2011-04-24 23:57 ` Wolfgang Denk
2011-04-26 3:38 ` Michael Spang
2011-03-17 19:47 ` [U-Boot] [PATCH 8/9] Add NAND " Michael Spang
2011-03-17 20:22 ` Scott Wood
2011-04-24 23:59 ` Wolfgang Denk
2011-04-26 4:01 ` Michael Spang
2011-04-26 4:27 ` Wolfgang Denk
2011-03-17 19:47 ` [U-Boot] [PATCH 9/9] Add README " Michael Spang
2011-04-25 0:01 ` Wolfgang Denk
2011-04-26 4:03 ` Michael Spang
2011-03-17 19:53 ` [U-Boot] [PATCH 0/9] TS-7800 port for U-Boot Michael Spang
2011-03-17 20:01 ` Albert ARIBAUD
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