Re: [U-Boot] at91 spi bus speed

2011-02-16 Thread Mike Frysinger
On Wednesday, February 16, 2011 03:26:00 wouter moors wrote: please dont top post > But I was wondering most why the bus speed seems to be limited to ~12MHz. > Is that a limitation of the at91sam9g20 or more likely a problem with the > board design? i was merely covering a question on common cod

Re: [U-Boot] at91 spi bus speed

2011-02-16 Thread wouter moors
So the 10MHz is a safe value I guess. But I was wondering most why the bus speed seems to be limited to ~12MHz. Is that a limitation of the at91sam9g20 or more likely a problem with the board design? On Tue, Feb 15, 2011 at 9:08 PM, Mike Frysinger wrote: > On Tuesday, February 15, 2011 06:56:4

Re: [U-Boot] at91 spi bus speed

2011-02-15 Thread Mike Frysinger
On Tuesday, February 15, 2011 06:56:42 wouter moors wrote: > I saw that in env_sf.c that the spi bus speed is set at 10 MHz and was > wondering if there was a specific reason for that? you mean it defaults to 10 MHz. boards can freely pick anything they want. some speed needed to be arbitrarily

[U-Boot] at91 spi bus speed

2011-02-15 Thread wouter moors
Hi, I'm experiencing some strange spi behaviour with an at91sam9g20. I changed the spi_xfer code (atmel_spi.c) to make use of the PDC that the at91sam9g20 offers. This works fine, but only up to an spi bus speed of 10 to 12 MHz. After that I see the CS going down sometimes before the transfer is c