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Boot partitions



I have a newbie question that I cannot see the answer to in the archives.
 
I am a Primary School teacher whose school has inherited a SPARC IPX running SunOS 4.1.3U.  I am new to SPARC's but not to Linux.  I've installed the base package of SLINK 2.1 (kernel 2.0.35) in a '/boot' partition '/sda1' (28MB).  I previously used to fire up the Sun with the following from the new prompt:
 
boot /sbus/esp@0,800000/sd@3,0
 
which I believe used to fire up vmunix on /sdb partion 3.
 
If I now boot using the above the machine fails.  The following works after a fashion:
 boot /sbus/esp/sd@0,0
the prom tries three times to find the kernel then shouts loudly that it cannot get past the 1GB limit (sorry working from memory).  I am then faced with a linux prompt from which if I type
1/vmlinuz-2.0.35 I can then get the system to boot.
 
My question:  what do I need to change the 'boot-disk' PROM setting to in order to enable autmagic booting without all this command line stuff?  Setting 'boot-disk' using 'setenv /sbus/esp/sd@0,0; 1/vmlinuz-2.0.35' has not worked.
 
Help sorely needed and thankfully appreciated.
 
Darren Garside 

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