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SubjectRe: [BUG] 2.6.25-rc3 hangs in early boot on Sun Ultra5
Mikael Pettersson writes:
> Booting 2.6.25-rc3 on my Ultra5 causes a hang before or as
> the console is switched over to the framebuffer. The console
> output is (extrapolated from dmesg in -rc2 and handwritten
> notes, as I don't have a serial cable to my U5):
>
> PROMLIB: Sun IEEE Boot Prom 'OBP 3.25.3 2000/06/29 14:12'
> PROMLIB: Root node compatible:
> *** the following line can't be seen in dmesg after rc2 has booted
> console [earlyprom0] enabled
> Linux version 2.6.25-rc3 (mikpe@sparge) (gcc version 4.2.3) #1 Mon Feb 25 18:49:41 CET 2008
> ARCH: SUN4U
> Ethernet address: 08:00:20:fd:ec:1f
> [0000000200000000-fffff80000400000] page_structs=262144 node=0 entry=0/0
> [0000000200000000-fffff80000800000] page_structs=262144 node=0 entry=1/0
> [0000000200000000-fffff80000c00000] page_structs=262144 node=0 entry=2/0
> [0000000200000000-fffff80001000000] page_structs=262144 node=0 entry=3/0
> OF stdout device is: /pci@1f,0/pci@1,1/SUNW,m64B@2
> PROM: Built device tree with 46617 bytes of memory.
> On node 0 totalpages: 32299
> Normal zone: 335 pages used for memmap
> Normal zone: 0 pages reserved
> Normal zone: 31964 pages, LIFO batch:7
> Movable zone: 0 pages used for memmap
> Built 1 zonelists in Zone order, mobility grouping on. Total pages: 31964
> Kernel command line: ro root=/dev/sda5
> PID hash table entries: 1024 (order: 10, 8192 bytes)
> clocksource: mult[28000] shift[16]
> clockevent: mult[66666666] shift[32]
> Console: colour dummy device 80x25
> *** the following line can't be seen in dmesg after rc2 has booted
> console handover: boot [earlyprom0] -> real [tty0]
>
> At this point rc3 hangs hard and won't even respond to sysrq.
>
> Another difference is that with rc2 the first few lines of kernel
> output while the console is still in OF mode either aren't shown
> or disappear quickly since the switch to the framebuffer occurs
> within a fraction of a second after the kernel has been loaded.
> With rc3 the kernel output (the text shown above) in the OF-mode
> console is very very slow.
>
> (I should have quoted my .config here but I forgot to bring it.
> It's exactly the same in rc2 and rc3, however.)
>
> I'll try some rc2->rc3 bisecting later.

Minor update: rc2-git7 has the slow initial console behaviour,
but successfully switches to the framebuffer. rc2-git8 however
hangs in the console handover. So I'll bisect git7->git8 next.

/Mikael


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