On 30.11.2007 13:42, Peter Stuge wrote:
On Wed, Nov 28, 2007 at 07:14:08PM -0500, Richard Smith wrote:
If I can I'd also like to upgrade the SPI flash part to as big as the chipset will support and if thats still not big enough to hold my kernel+rootfs then change to a USB nand drive.
I'm waiting for sales information for 32Mbit flash, and will try to get the moq down a bit from 1k so I can order some.
The performance of SPI flash parts is usually dependent on three factors: * Clock frequency * Pinout (1-Read or 2-Read or 4-Read) * Bytes per Read command.
With the IT8716F SPI translation feature, the best possible result is: (freq/8/2) Byte/s That is roughly 2 MByte/s, way too slow to try to boot from it.
If you have a SPI controller which supports continuous 4-Read at 85 MHz, you can get up to 42 MByte/s in linear reads. Such a solution would be really nice.