sash64 missing?

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astouffer
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sash64 missing?

Unread postby astouffer » Wed Sep 14, 2016 6:43 pm

My copy of the 6.5.29 overlays doesn't seem to have sash64 in the root of the first cd. fx.64 is located in /stand where it should be but no sign of sash64. What is up with that?

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foetz
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Re: sash64 missing?

Unread postby foetz » Wed Sep 14, 2016 7:04 pm

on the cd it's on a different partition

twix
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Re: sash64 missing?

Unread postby twix » Wed Sep 14, 2016 10:55 pm

Try /dist/sa(sash64).
So you open sa with sash64 as a parameter.
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robespierre
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Re: sash64 missing?

Unread postby robespierre » Thu Sep 15, 2016 12:41 am

twix wrote:Try /dist/sa(sash64).
So you open sa with sash64 as a parameter.


That works when netbooting over TFTP. When booting from a local CD, you use

Code: Select all

dksc(0,5,8)sash64

(where 5 is your CDROM SCSI ID). The PROM boots using the volhdr, partition 8; not the EFS volume, partition 7.
To move files to or from a volhdr within IRIX (or the miniroot), use dvhtool. To move files from or to a "sa" file, use mkboottape.
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twix
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Re: sash64 missing?

Unread postby twix » Thu Sep 15, 2016 1:34 am

Anyway, the point here is that the different sash versions are located within sa, so you are not going to find individual files on the CD, as with fx.
SGI machines: "wtmc04" Image, "blackjack" Image and "Biofysica" Image

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foetz
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Re: sash64 missing?

Unread postby foetz » Thu Sep 15, 2016 1:52 pm

twix wrote:Anyway, the point here is that the different sash versions are located within sa, so you are not going to find individual files on the CD, as with fx.

no, as i said already and robespierre elaborated further, the sash files are just on a different partition. hence something like

Code: Select all

dksc(0,5,8)sash64
works.

to get the files from the cd:

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dvhtool -v get sash64 sash64 /dev/rdsk/dks2d0vh

assuming your cd is scsi id 2

robespierre
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Re: sash64 missing?

Unread postby robespierre » Thu Sep 15, 2016 2:00 pm

"mr" is also on partition 8 of an installation CDROM, in addition to being in the "/dist/sa" file, so there are two copies of this stuff in two different places. Redundancy doesn't seem to have been a problem they were anxious about.
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SAQ
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Re: sash64 missing?

Unread postby SAQ » Wed Sep 21, 2016 5:48 pm

Bigger explanation: SGIMIPS boot process involves the PROM booting up and then searching for the appropriate SASH file to load, then SASH moves on to load what you want (usually IRIX, but sometimes fx or ide or something else).

The PROM doesn't know how to read EFS or XFS or FAT or most of the filesystems that an OS can, all it can read is a very simple filesystem called the volume header. In order for the PROM to access sash it has to be located in that volume header filesystem, which is in partition 8 on
SGI disklabel disks. You can read/write/list it in IRIX using the 'dvhtool' command.
Possibly confusing at first, but powerful - you don't need to have a set root filesystem, or a bootloader at a fixed address.

There's one on the volheader so the PROM can get at it and one under the "regular" filesystem so it's easier for sysadmins to get at to set up a netinstall tree.
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