Bug 35274
| Summary: | Kernel 2.4.2-0.1.49 detects 80w IDE cable as 40w | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Raw Hide | Reporter: | Herbert Rutledge <train> |
| Component: | kernel | Assignee: | Michael K. Johnson <johnsonm> |
| Status: | CLOSED NOTABUG | QA Contact: | Brock Organ <borgan> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 1.0 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i686 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2001-04-09 01:40:58 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
I'm sorry to say this, but this is by design. VIA is the only chipset that even offers the ability to autodetect the 80ribbon cable, but we have disabled this in our kernel as we found that the chipset misdetected this (and as a consequence, corrupted / crashed) in cirtain circumstances. You should be able to override this on the lilo commandline (or in a lilo "append" line) by specifying "ideX=ata66", where X is 0 or 1 (0 is primary cable, 1 is secondary cable). I have to warn you though. Some versions of the VIA chipset have a bug where they corrupt data on disk or crash, even if you do have the 80 ribbon cable. If you do try the "ide0=ata66" option, and it does not work, please reopen this bug. "VIA is the only chipset that even offers the ability to autodetect the 80ribbon cable" ??? Somehow I doubt it. I have an Intel 815E chipset and it happily autodetects 40- and 80-ribbon cables. This chipset was available at least from June 2000. |
Kernel 2.4.2-0.1.49 detects 80w IDE cable as 40w with VIA VTC82C686A chipset, thus setting UDMA 33 instead of UDMA 66. Kernel compiled using VIA chipset and Use DMA by Default options. From /proc/ide/via using Kernel 2.4.2-0.1.28: < Cable Type: 80w 80w < Cycle Time: 30ns 60ns 30ns 180ns < Transfer Rate: 66.0MB/s 33.0MB/s 66.0MB/s 11.0MB/s From /proc/ide/via using Kernel 2.4.2-0.1.49: > Cable Type: 40w 40w > Cycle Time: 60ns 60ns 60ns 180ns > Transfer Rate: 33.0MB/s 33.0MB/s 33.0MB/s 11.0MB/s