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Re: [TEKNIK] scsiFast-40



On Fri, Apr 14, 2000 at 22:22:49 +0200, Lars Vahlen wrote:

> Jodå, kortet stödjer UW och frågan är hypotetisk eftersom jag inte har någon
> device som kör så snabbt. Orsaken till att jag frågar är bara att
> meddelandena vid boot anger 20 trots att drivern förhandlar med NVRAM på
> kortet. Av sym53c8xx_spec.h framgår det att just detta chipset inte
> förväntas stödja UW men frågan är om det går att ändra?

Hvor har du fundet sym53c8xx_spec.h ? (jeg kan ikke finde den)
I følge   /usr/src/linux/drivers/scsi/sym53c8xx_defs.h :
 {PCI_DEVICE_ID_NCR_53C875, 0x2f, "875E",  6, 16, 5,                 \
  FE_WIDE|FE_ULTRA|FE_DBLR|FE_CACHE0_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|FE_RAM}\
         **********

(jeg har set i kerne 2.2.13)

Læs  /usr/src/linux/drivers/scsi/README.ncr53c8xx

Først (til en IBM 4GB UW jeg har):
 # IBM 4GB UW på ID=0: 
 echo "setwide 0 1" >  /proc/scsi/sym53c8xx/0
 echo "setsync 0 10" > /proc/scsi/sym53c8xx/0

I det hele taget er der ikke andre SCSI driver der så godt lader
sig styre via /proc systemet under drift som symbios driverne i linux.
(adaptec, initio, osv. har langt igen på dette punkt)

Men hvis dit 53c875E ikke understøtter UW, så nytter det jo ikke.
UW er sætter også krav til det elektriske.

Jeg har en Asus SC875 med 53c875 og det er et par år siden jeg anskaffede
denne. Den kører UW .

Men ved ovenstående "setsync <target> <sync>" kan jeg få
med hhv. 25, 50, 75 og 10  :
kernel: sym53c875-0-<0,*>: WIDE SCSI (16 bit) enabled. 
kernel: sym53c875-0-<0,*>: FAST-10 WIDE SCSI 20.0 MB/s (100 ns, offset 15) 
kernel: sym53c875-0-<0,*>: WIDE SCSI (16 bit) enabled. 
kernel: sym53c875-0-<0,*>: FAST-5 WIDE SCSI 10.0 MB/s (200 ns, offset 15) 
kernel: sym53c875-0-<0,*>: WIDE SCSI (16 bit) enabled. 
kernel: sym53c875-0-<0,*>: FAST-5 WIDE SCSI 6.7 MB/s (300 ns, offset 15) 
kernel: sym53c875-0-<0,*>: WIDE SCSI (16 bit) enabled. 
kernel: sym53c875-0-<0,*>: FAST-20 WIDE SCSI 40.0 MB/s (50 ns, offset 15)

-- 
mvh Frank Damgaard  | http://home3.inet.tele.dk/frda/



 
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