On 05/13/13 16:23, Thomas Petazzoni wrote:
On Mon, 13 May 2013 15:06:55 +0200, Sebastian Hesselbarth wrote:
Please note that normally barebox images are expected to be runnable
second stage (bootm barebox.bin). Though not really mandatory this still
is a nice feature for development. This becomes difficult to support if
the initial code expects the registers at 0xd0000000, hence I suggested
remapping it in the kwb image so that all second stage code can already
work on the remapped registers.
Yeah, this is bugging Thomas and me for some time. The tricky part in
this is, that the register for setting the internal register base is in
the internal registers itself. You don't know the base address, you
cannot remap it - you can't even read it. Thomas is working on
something, but he will have to comment on that.
One solution for Barebox is to have a DATA line in our kwbimage.cfg
that does:
DATA 0xd0020080 0xf1000000
and so when Barebox boots, the remapping to 0xf1 is already done, and
we don't have to worry about it. This way, a Barebox can chainload a
second Barebox.
Thomas, have you tried the above? I did and Dove immediately stops
responding to Xmodem transfer. I have the strong feeling, that BootROM
relies on stuff located at 0xd0000000.
So remapping _that_ early will maybe not work either.
Sebastian
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