Re: [XenARM] Problems when booting on OMAP5432 devboard

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-07-01 at 11:54 +0800, Chen Baozi wrote:
> On Thu, Jun 27, 2013 at 01:10:01PM +0100, Ian Campbell wrote:
> > On Thu, 2013-06-27 at 19:55 +0800, Chen Baozi wrote:
> > > Hi Ian,
> > > 
> > > After enabling the UART, I have been tring to finish the rest of booting.
> > > However, the output information stops at "Placing Xen at XXXX-XXXX" like
> > > following:
> > > 
> > > Starting kernel ...
> > > 
> > > - UART enabled -
> > > - CPU 00000000 booting -
> > > - Machine ID 00000ec1 -
> > > - Started in Hyp mode -
> > > - Zero BSS -
> > > - Setting up control registers -
> > > - Turning on paging -
> > > - Ready -
> > > RAM: 0000000080000000 - 00000000ffffffff
> > > 
> > > MODULE[1]: 00000000a0000000 - 00000000a0400000 
> > > Placing Xen at 0x00000000ffe00000-0x0000000100000000
> > > 
> > > What could be the most possible problem of this case?
> > 
> > This is a about the point where we would shift from early_printk to the
> > proper console driver, so I expect you simply don't have the console
> > setup.
> > 
> Hi Ian,
> 
> I guess that it might not all about console driver, because early_printk
> does not work properly just after we have updated "the copy of boot_pgtable
> to use the new paddrs" in setup_pagetables(). It seems that
> FIXMAP_ADDR(FIXMAP_CONSOLE) has been destroyed after the updating without
> being restored.

Hrm, I think the expectation is that the fixmap will be copied as part
of that and doesn't need (or receive) any additional fixups (see around
"Link in the fixmap pagetable"), but it is worth checking for sure.

You could probably profitably sprinkle some more early_print around the
place during that sequence for debugging purposes.

BTW I've just checked a boot here and after the "Placing Xen" message
there should be two more early_printk's which are the "Xen heap: XXX
pages..." and "Looking for UART.." ones before things switch to the real
console, so you are right that it isn't making it to the real console
driver.

Ian.



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