Hi Julian,
does anyone know if there is a limitation on firewire debugging on a
machine with > 4GB or memory?
I don't know of any Firewire cards that support physical access
*above* 4GB. They may exist.
For instance, the (last?) Texas Instruments PCIe 1394a/b chip, the
XIO2213B, has the following text in it's data sheet -
>The physical upper bound register is an optional register and is
>not implemented.
.. and this is the firewire OHCI register that contains the upper 16
bits of the architected 48-bit physical address.
So, you can probably use it for some form of amd64 kernel debug since
kernel txt/data/bss is < 4G, but accessing anything above 4G won't work.
later,
Peter.
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