Re: [PATCH 3/5] arm: initial support for Marvell Dove SoCs

[Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>]

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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