Unale to Boot the Cd
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Quoted 11 lines · Andy Walker
Quoted 9 lines
A major issue with (older) PA-Risc CDRoms is not addressed in most documentations:
Any CDRom player wil work at runtime but booting from the player requires a
different blocksize than most other architectures. Correct me if I'm wrong but
PA-Risc CDRoms need a 2 KByte blocksize where most other architectures use 512Byte blocksize.Back to front, I'm afraid. Sun, older HP (and possibly older SGI)
Yes!
Quoted 4 lines
all
want a block size of 512 bytes for booting. I guess the idea was that the ROM monitor could treat cds and harddisks alike if they had the same block size = less code!
precisely
Quoted 3 lines
The PC world standardized on 2K bytes. Some cd units, notably Plextor handle the 2 Kbytes <-> 512 byte switch automagically in the firmware. Good old Toshibas (XM-3301 etc.),
and 3401B. Also NEC Multispin, definitely 3x, I think 6x as well (the ones with "flip-down" caddy entry and a lit LCD).
Quoted 4 lines
as loved by HP and Sun, have a couple
of solder pads that can be cut for 512 bytes and joined for 2K bytes. On some units these "switches" are available as jumpers, or exposed as switches on the external case.
Some (old Toshibas for sure) could be "tweaked" to do it through code (SCSI pages). I remember something about it in 93 or 94 on comp.sys.sgi.admin. There was some code posted that did it (at least for me, at least then...)
Quoted 7 lines
For more info google for the Sun CDROM FAQ, or go via www.sunhelp.org.
-Andy
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