Re: [microblaze-uclinux] Xmdstub connect on serial port

[John Williams <jwilliams@itee.uq.edu.au>]

Hi Jan,

Schunke Jan-Hendrik wrote:
> I am using the latest mb_vanilla_ddr on Insight V2MB1000 with P160
> Communication (This should be Johns setup). Two things:
> 
> 1) Some of the Gpio signals and the sram_addr signals are not locked
> down. This should be changed because there is the possibility to damage
> your hardware. My suggestion is to put them on the LVDS transmit ports.

I agree - I periodically remember and then forget this fact.  I wish 
there was a synthesis option to remove un-constrained signals, but 
anyway.  Apparently there's an EDK component somewhere called 
bus_splitter or similar, that can be used for this purpose, but I 
haven't looked into it.

In the meantime if you have an safer UCF file please send it to me and 
I'll update the download.

> 2) I am having a hard time to get the connection to the xmdstub. When
> compiling in xmdstub mode I cannot connect to the xmdstub after
> downloading the bitstream (I did update the bistream).

A common cause of this is to have the reset held high - in mbvanilla_ddr 
it's routed to DIP switch 1, which should be in the "up" position. But 
since you got the loopback running that's probably not the cause.

Can you try this bitstream and let me know if it works?  I've been using 
it on my board with no problems.   Also what rev of the insight board 
are you using, 1 or 3 (no revision 2 as far as I know)?

http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux/Downloads/_files/download.bit

> When I run in executable mode and use the loopback.c source then I can
> see the messages printed to teminals on COM1 and COM2 (I use Tera Term).

In loopback if you type characters on either terminal do they get echoed 
back to the screen?

Regards,

John

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