On Monday, August 13, 2007 8:47 AM Matt Gessner wrote: To: Leonid; u-boot-users@lists.sourceforge.net Subject: RE: [U-Boot-Users] USART on at91rm9200
Are you certain you configured it properly? Did you just tell u-boot
to use the USART for your output port? Did you miss some
configuration in your boot setup (the code loaded into SRAM before you
start) that might be causing a problem?
This is always a possiblity, but I'm working with u-boot in general and with this particular CPU for so long, I cannot think of something I have really missed. All defines are in place, I even can get serial data on USART output, but TX ready/ RX ready bits of CSR are not working somehow.
BTW, what USARTs (if any) are available on your board? At91rm9200-ek evaluation kit has USART1 connected to DB9 port.
I have all 4 USARTs and the DBGU port wired in. They all work fine
under linux, but again, not under u-boot; the only port used is
the DBGU port under u-boot.
I'm a little curious why you aren't using the DBGU port?
For my project I need some USART functionality DBGU doesn't have. For the time being I just wanted to verify USARTs are working at all and using them as serial ports on u-boot looked for me as a simplest test... Probably I was wrong...
Regards,
Leonid.