RE: [microblaze-uclinux] can't mount root fs...!?

[Erik Hansen <erik@erik-hansen.de>]

Stephen,

>I recently built the mbvanilla_net hardware and compiled the kernel.
>However, I experienced the exact error as Flavius when downloading the
>image.elf file. So I tried the workaround below, however this time I
>received no response on the console, and the following XMD errors.
>
>Unable to Read register : R1
>Unable to Read register : R1
>Unable to Read register : R1
>XMD Continue: Error in single step
>Unable to Read register : R1
>Cannot read from target
>
>Any ideas? Please forgive me if this problem is obvious, as I am
>somewhat new to this.

I expierienced the same problem with xmd several times.
It seems as if xmd / xmdstub can not handle large amounts
of data beeing transfered. Which is quite anoying after
downloading for aprox. 5 minutes. Nevertheless things work
out quite OK for me, when I issue a reset command after
downloading and before starting Linux.

Issuing the command as below should help you avoiding
this error:

xmd> dow -data image.bin 0x80000000
xmd> rst
xmd> rwr pc 0x80000000
xmd> con

Of course you can use stp instead of con.
I mostly do so in order to check that I have
typed in the 0x80000000 correctly (much to
many '0's in there) and mb starts at to
correct address.

In order to make things more comfortable. You might
write a litte funktion, i.e. runlin, in TCL which executes these
commands and then add 'source mycommands.tcl'
to your xmd.ini, so you can start linux with
your runlin command.

Erik  

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