2.4.0-test6-pre7 sparc-smp boot failure (bootmem_init)

From: Bert de Bruijn (bob@ccl.kuleuven.ac.be)
Date: Tue Aug 08 2000 - 07:01:34 EST

on my dual cpu cparc20, 112 MB memory (64+16+16+16 in slots 0,1,2,3),
2.4.0-test6-pre7 (also tried pre5, same mm/ code, same result) dies at
boot time right before fb initialisation:

bootmem_init: Scan sp_banks, init_bootmem(spfn[205],bpfn[205],mlpfn[c000])
free_bootmem: base[0] size[5000000]
free_bootmem: base[8000000] size[1000000]
reserve_bootmem: base[0] size[205000]
reserve_bootmem: base[205000] size[1800]
Booting Linux...
Level 15 InterruptLevel 15 Interrupt

and then it drops back to the ok prompt.

With nosmp as a kernel parameter, it only generates 1 Level 15 Interrupt
message..

>From what I understand, free_bootmem should not only see the first two
chunks of physical address space (80MB @ offset 0, and 16 MB @ offset 128
MB), but also the third one (16 MB @ offset 192 MB).

With mem=192m as a kernel parameter, it works as expected (96 MB memory
recognised and used). With mem=256, it's the same as without mem=
parameter.

btw, /proc/openprom/memory/available contains (all) 3 chunks of physical
memory:
0x05000000 = 80 MB @ 0x0 = 0 MB,
0x01000000 = 16 MB @ 0x08000000 = 128 MB,
0x00f42000 = 16 MB - 760 KB @ 0x0c000000 = 192 MB

I don't know why the last SIMM isn't reported with it's full capacity. 

-- 
/* Bert de Bruijn                 E-mail@work: bert.debruijn@mind.be  */
/* Linux & Open Source consultant     http://alumni.ulyssis.org/~bob/ */

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