Re: usb_get_status(): what a weird implementation !
From: Francis Moreau
Date: Mon Jun 30 2008 - 10:04:11 EST
On Mon, Jun 30, 2008 at 3:51 PM, Oliver Neukum <oliver@xxxxxxxxxx> wrote:
>
> If your buffer is smaller than CACHE_LINE_SIZE it should work.
> However, this needs input from people who understand DMA in and out.
yeah, that's the reason why it's a hack.
Maybe adding a new helper in the dma API would be better...
> But how large is 2 * CACHE_LINE_SIZE compared to the kernel stack?
CACHE_LINE_SIZE = 32 bytes is common for embedded systems I guess.
For big system, I dunno.
Kernel stack size is usually 4KiB.
--
Francis
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