[PATCH 0/4] mvebu: Make 2nd-stage booting possible
u.kleine-koenig at pengutronix.de
Tue Feb 28 08:06:37 PST 2017
On Tue, Feb 28, 2017 at 07:59:47AM +0100, Sascha Hauer wrote:
> On Sat, Feb 25, 2017 at 09:52:38PM +0100, Uwe Kleine-König wrote:
> > Hello,
> > one specialty of mvebu is that it has a movable register window. Its
> > base address is configured within this register range, so there is no
> > way to find out the current position. The BootROM leaves this window at
> > 0xd0000000, however it is beneficial to move it further to the end of
> > the address range (usually 0xf1000000) to benefit from more continuous
> > RAM. For this reason one of the first things that barebox does it to
> > move the window accordingly. If however barebox is loaded as a second
> > stage image this results in a crash as the register base address
> > register is already moved.
> > This series implements that the called image gets the base address from
> > the barebox header. It defaults to 0xd0000000 which is right for the
> > (unaware) BootROM and when barebox jumps into such an image the register
> > position is passed accordingly.
> This makes the 2nd stage images unnecessary, right? Can you remove them
> from images/Makefile.mvebu?
I thought about that already, too, but they are still necessary when you
convert from U-Boot to barebox or upgrade from an older barebox. So I
think keeping them for now makes sense.
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