From: Albert ARIBAUD <albert.u.boot@aribaud.net>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v4] nios2: convert dma_alloc_coherent to use malloc_cache_aligned
Date: Mon, 19 Oct 2015 10:27:00 +0200 [thread overview]
Message-ID: <20151019102700.79ea3782@lilith> (raw)
In-Reply-To: <5624A73E.4010705@wytron.com.tw>
Hello Thomas,
On Mon, 19 Oct 2015 16:18:06 +0800, Thomas Chou <thomas@wytron.com.tw>
wrote:
> Hi Albert,
>
> On 10/19/2015 01:52 PM, Albert ARIBAUD wrote:
> > Not sure I'm getting this, so for my own education: what prevents from
> > invalidating the cache, or IOW, what would happen if it was invalidated
> > at this point rather than flushed?
>
> This is a hardware limitation. The nios2 cpu with 4 bytes dcache line
> size does not support the initda instruction, which is needed to
> invalidate dcache.
>
> Recently we added a check, if the nios2 cpu support initda instruction,
> then we use invalidate_dcache, otherwise we use flush_dcache.
Now I understand. Thanks!
> Best regards,
> Thomas
Amicalement,
--
Albert.
next prev parent reply other threads:[~2015-10-19 8:27 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-05 2:57 [U-Boot] [PATCH] nios2: convert dma mapping to use dm cpu data Thomas Chou
2015-10-06 6:49 ` [U-Boot] [PATCH v2] nios2: convert dma_alloc_coherent to use memalign Thomas Chou
2015-10-08 21:43 ` Marek Vasut
2015-10-09 8:48 ` Thomas Chou
2015-10-09 11:35 ` Thomas Chou
2015-10-09 11:31 ` [U-Boot] [PATCH v3] " Thomas Chou
2015-10-09 14:49 ` Marek Vasut
2015-10-10 5:33 ` Thomas Chou
2015-10-10 18:19 ` Marek Vasut
2015-10-11 1:48 ` Thomas Chou
2015-10-11 12:15 ` Marek Vasut
2015-10-12 5:29 ` [U-Boot] [PATCH v4] nios2: convert dma_alloc_coherent to use malloc_cache_aligned Thomas Chou
2015-10-12 10:32 ` Marek Vasut
2015-10-12 12:55 ` Thomas Chou
2015-10-12 13:46 ` Marek Vasut
2015-10-13 0:17 ` Thomas Chou
2015-10-14 1:48 ` Thomas Chou
2015-10-16 22:53 ` Marek Vasut
2015-10-16 22:56 ` Marek Vasut
2015-10-17 2:59 ` Thomas Chou
2015-10-17 11:52 ` Marek Vasut
2015-10-19 5:52 ` Albert ARIBAUD
2015-10-19 8:18 ` Thomas Chou
2015-10-19 8:27 ` Albert ARIBAUD [this message]
2015-10-14 1:42 ` [U-Boot] [PATCH v5] " Thomas Chou
2015-10-16 8:29 ` [U-Boot] [PATCH v6] " Thomas Chou
2015-10-16 22:58 ` Marek Vasut
2015-10-18 23:46 ` Thomas Chou
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20151019102700.79ea3782@lilith \
--to=albert.u.boot@aribaud.net \
--cc=u-boot@lists.denx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox