Re: [Xen-devel] Problems when booting on OMAP5432 devboard

[Chen Baozi <baozich@xxxxxxxxx>]

On Jul 1, 2013, at 4:50 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

> 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.
That's exactly what I did just now. And it is interesting that early_printk 
doesn't work just after the updated boot_pgtable (p = (void *) boot_pgtable + 
dest_va - (unsigned long) _start;) has been accessed (e.g. access to 
p[i].pt.base).

Baozi.

> 
> 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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