From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v4] nios2: convert dma_alloc_coherent to use malloc_cache_aligned
Date: Mon, 12 Oct 2015 15:46:13 +0200 [thread overview]
Message-ID: <201510121546.14072.marex@denx.de> (raw)
In-Reply-To: <561BADA7.1050008@wytron.com.tw>
On Monday, October 12, 2015 at 02:55:03 PM, Thomas Chou wrote:
> Hi Marek,
Hi Thomas,
> On 10/12/2015 06:32 PM, Marek Vasut wrote:
> > Wouldn't invalidate_dcache_range() be enough here ? You don't care about
> > the data in the newly allocated area at this point I guess -- either you
> > fill them in and then flush, for DMA from CPU to device OR you receive
> > data from device to CPU and then you invalidate this buffer again.
>
> No. We cannot use invalidate cache here. This is related to cache design
> of nios2, kind of direct mapped cache.
Can you please expand on this ?
btw. I was thinking about this whole cache situation. Please don't get me wrong,
my intention is not to put way more work unto you and/or grind you about minor
details. I hope it doesn't look that way to you.
Best regards,
Marek Vasut
next prev parent reply other threads:[~2015-10-12 13:46 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 [this message]
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
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
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