Hi,
On Thu, May 06, 2010 at 04:13:41PM +0200, Alexander Stein wrote:
>
> I can't say much about actual transfer rates. But i noticed a real slowdown
> when the filesystem buffer is about to be flushed.
> We are using a COldfire 5484 and AFAIK there is no DMA for SPI, at least we
> don't use it.
Am Donnerstag, 6. Mai 2010 15:59:44 schrieb Wolfgang Wegner:
> Hi Alexander,
>
> On Thu, May 06, 2010 at 03:33:53PM +0200, Alexander Stein wrote:
> [...]
>
> > IIRC 400kBytes/second is the initial speed for SD cards on SPI. The card
> > itself responds which max speed it can handle. Which could b
Hi Alexander,
On Thu, May 06, 2010 at 03:33:53PM +0200, Alexander Stein wrote:
[...]
> IIRC 400kBytes/second is the initial speed for SD cards on SPI. The card
> itself responds which max speed it can handle. Which could be adjusted later
> (up to 25MHz or even more).
the initial speed is 400 k
Hello Wolfgang,
Am Donnerstag, 6. Mai 2010 15:13:14 schrieb Wolfgang Wegner:
> In U-Boot, I can get read speeds with fatload of around 400 kBytes/second,
> which seems reasonable as the card can handle 25 MHz SPI speed. (And, it
> would be sufficient for our application.)
IIRC 400kBytes/second is
Hi all,
sorry for the off-topic question, but I seemingly did not yet find
the right search string and was hoping to find experienced embedded
people here to point me in the right direction.
I have connected a SD card to a coldfire MCF54455 via SPI, accessible
from both U-Boot and linux. The kern
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