Re: [microblaze-uclinux] uart issue in "fs-boot" - ML505

[Michal Simek <monstr@xxxxxxxxx>]

Hi Tyler,

I tested it last week.
First of all. You should load u-boot.srec instead of u-boot-s.srec(srec format
for relocable u-boot to flash).
There could be a problem (but I am not 100% sure for uartlite) if your
u-boot.srec file contains CR-LF ending.
If is problem there, just call dos2unix u-boot.srec and check it in any hex
editor (or in mc with F3).

Does it work?

Regards,
Michal


> 
> Hi all,
> I'm experiencing an issue with loading the U-BOOT SREC file over serial
> to FS-BOOT. I see FS-BOOT outputs on the kermit console and it just
> hangs waiting for the SREC even long after "cat /tftpboot/u-boot-s.srec
>> /dev/ttyS0" returns.
> I then looked at FS-BOOT code and insert debug messages inside of
> "get_ch" routine to figure out what kind of data FS-BOOT is getting and
> noticed that the function XUartLite_mIsReceiveEmpty(UART_BASEADDR) is
> always false, even if I don't send anything to the board from the host,
> hinting that there's always data in the receive buffer and these
> characters are always FFFFFF.....
> 
> So it seems like the setting is incorrect somewhere since the while loop
> is not working. Has anybody came across this behavior?
> 
> char get_ch(void) {
>   while (XUartLite_mIsReceiveEmpty(UART_BASEADDR)) ;
> .......
> }
> 
> Thanks
> Tyler
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> 
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