| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | README for WarpEngine/A4000T/A4091 SCSI kernels. |
| 2 | |
| 3 | Use the following options to disable options in the SCSI driver. |
| 4 | |
| 5 | Using amiboot for example..... |
| 6 | |
| 7 | To disable Synchronous Negotiation.... |
| 8 | |
| 9 | amiboot -k kernel 53c7xx=nosync:0 |
| 10 | |
| 11 | To disable Disconnection.... |
| 12 | |
| 13 | amiboot -k kernel 53c7xx=nodisconnect:0 |
| 14 | |
| 15 | To disable certain SCSI devices... |
| 16 | |
| 17 | amiboot -k kernel 53c7xx=validids:0x3F |
| 18 | |
| 19 | this allows only device ID's 0,1,2,3,4 and 5 for linux to handle. |
| 20 | (this is a bitmasked field - i.e. each bit represents a SCSI ID) |
| 21 | |
| 22 | These commands work on a per controller basis and use the option 'next' to |
| 23 | move to the next controller in the system. |
| 24 | |
| 25 | e.g. |
| 26 | amiboot -k kernel 53c7xx=nodisconnect:0,next,nosync:0 |
| 27 | |
| 28 | this uses No Disconnection on the first controller and Asynchronous |
| 29 | SCSI on the second controller. |
| 30 | |
| 31 | Known Issues: |
| 32 | |
| 33 | Two devices are known not to function with the default settings of using |
| 34 | synchronous SCSI. These are the Archive Viper 150 Tape Drive and the |
| 35 | SyQuest SQ555 removeable hard drive. When using these devices on a controller |
| 36 | use the 'nosync:0' option. |
| 37 | |
| 38 | Please try these options and post any problems/successes to me. |
| 39 | |
| 40 | Alan Hourihane <alanh@fairlite.demon.co.uk> |