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- Path: sparky!uunet!auspex-gw!guy
- From: guy@Auspex.COM (Guy Harris)
- Newsgroups: comp.sys.sun.hardware
- Subject: Re: SPARCClassic
- Message-ID: <15479@auspex-gw.auspex.com>
- Date: 13 Nov 92 06:07:10 GMT
- References: <hanson.721434952@pogo> <1992Nov12.180856.3446@megatek.com> <1992Nov12.213456.4551@ucs.att.com>
- Sender: news@auspex-gw.auspex.com
- Organization: Auspex Systems, Santa Clara
- Lines: 38
- Nntp-Posting-Host: auspex.auspex.com
-
- >The PROMs are set up to deal with the SVr4/Solaris2 file system formats.
-
- Are you certain that the PROMs know a file system format from a hole in
- the ground? No previous Sun box had a PROM that knew anything about file
- system formats, other than that the first few blocks of a disk are a
- "boot block" that should be sucked into memory and jumped to.
-
- That boot block has, at least in 4.x and possibly 5.x, the block numbers
- of a file on the root file system jammed into it when it's installed; it
- reads those blocks into memory and jumps to *that* program.
-
- *That* program - "/boot", in 4.x - knows about the file system format.
-
- In 5.x, there's a lot more to the boot stuff, but I very much doubt the
- PROM has to know anything about the file system format. It's probably
- all done by programs read in *by* the PROM.
-
- (Besides, the SVR4 file system format isn't *that* different from the
- SunOS 4.x format.
-
- If you're referring to the *executable image format*, that's a different
- matter; however, boot blocks aren't necessarily ELF images.
-
- And even if boot blocks *do* have ELF headers, if Sun actually *wanted*
- to release a version of the SPARCclassic that ran 4.1.x, they could
- probably have had a version of "installboot" for 4.1.x that knows how to
- put an ELF header on a boot block.)
-
- >The boxes are obviously a carrot to draw the market to Solaris 2.x.
-
- The boxes are obviously a carrot to get people to buy lots of
- relatively-inexpensive Sun color SPARC machines; there's no need to drag
- Sun's desire to promote Solaris 2.x in order to construct a rationale
- for Sun releasing the boxes.
-
- You can probably use that desire as one of the reasons why Sun didn't
- offer a 4.1.x port for the boxes, and add in "more porting and testing
- efforts" as another reason.
-