loader(8) readin failed on 7.2R and later including 8.0R

[Carsten Bäcker]

Hello,

i ran into a similar problem when recently trying to install 8.0R on an
embedded system. We've been using this hardware for a couple of
years with FreeBSD 4.11 and didn't see any problem like this.

Disabling the memory hole (15-16M) solved the problem here, but
that shouldn't be a solution. I wonder whether it's a loader-, or a
BIOS-problem, since memory-allocation should respect reserved
areas.

Best regards
Carsten Bäcker


On Sunday 06 December 2009 12:16:36 am Hiroki Sato wrote:
>  Hiroki Sato<h... at freebsd.org>  wrote
>    in<20091205.184250.201700943.... at allbsd.org>:
>
>  hr>   A summary so far is:
>  hr>
>  hr>   1)  a<8MB 7.1R kernel + stock 8.0R loader
>  hr>   2a) a>8MB 8.0R kernel + stock 8.0R loader
>  hr>   2b) a>8MB 8.0R kernel + 8.0R loader with LOADER_NO_GPT_SUPPORT=yes
>  hr>   2c) a>8MB 8.0R kernel + loader with your patch
>  hr>   3a) a<8MB 8.0R kernel + stock 8.0R loader
>  hr>   3b) a<8MB 8.0R kernel + 8.0R loader with LOADER_NO_GPT_SUPPORT=yes
>  hr>   3c) a<8MB 8.0R kernel + loader with your patch
>
>   Grr, I double-checked how it got stuck, then I found the console
>   redirect was disabled because of an old device.hints.  The revised
>   summary is:
>
>         loading text      loading syms       boot
>    1)   OK                OK                 OK
>    2a)  "readin failed"   -                  -
>    2b)  OK                "skipped!"         OK
>    2c)  OK                "skipped!"         OK
>    3a)  OK                OK                 OK
>    3b)  OK                OK                 OK
>    3c)  OK                OK                 OK
>
>   So, the case 2c shows that your patch solves the problem in the case
>   2a.  Thank you! :)
>
>   Loading>8MB kernel works now, but loading syms sections still fails
>   even in the case 2c.

Ok.  Your system's SMAP is kind of weird (it has a very small region above
1MB, so it may not deal well with "large" kernels, though I thought it had
enough room for at least a 12MB kernel.  Hmm, the size of the kernel file may
be deceptive though since it does not include BSS.  I wonder if it is trying
to load the symbols after the BSS.

-- 
John Baldwin
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