From: Thomas Chou <thomas@wytron.com.tw>
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 16:18:06 +0800 [thread overview]
Message-ID: <5624A73E.4010705@wytron.com.tw> (raw)
In-Reply-To: <20151019075225.1363f49f@lilith>
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.
Best regards,
Thomas
next prev parent reply other threads:[~2015-10-19 8:18 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 [this message]
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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