[U-Boot-Users] SPI EEPROM on MBX problem

[Antonio Di Bacco]

Yes, I'm feeling so stupid! 

Thank you very much!


On Saturday 18 March 2006 22:20, you wrote:
> Hello Antonio,
>
> Antonio Di Bacco wrote:
> >I use the sspi command like this:
> >
> >sspi 0 8 05   (for Gurevitch patch)
> > 05 is the code read a configuration register.
> >
> >Sometimes the EEPROM answer FF, some others 00 , it is completely
> > randomic.
>
> The command you are using is not exactly correct. You specified only 8
> bits to transfer and this is enough to only send the command (0x5). But
> SPI master is also supposed to provide clock for the slave to answer.
> So, use a different command:
>
>     sspi 0 16 05
>
> Then you'll see that the second byte of the response contains the corret
> value.
>
> Same applies when you decide to read your eeprom.
>
> Happy hacking,
> Vladimir