lacsap@media-lab.MEDIA.MIT.EDU (Pascal Chesnais) (12/14/90)
I got this in the mail: pasc Following is NeXT Technical Alert 90-1, describing a small bug in the Upgrade2.0 application which affects 68040 upgrades. We will be mailing a printed copy of this Alert to all Support Centers of record shortly. If you can receive NeXT Mail attachments and want the WriteNow document, please send mail to ask_next@NeXT.COM and let us know. Alan M. Marcum NeXT Technical Support - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - NeXT Technical Alert 90-1 Summary Cannot boot after upgrading a 68030-based 2.0 machine to a 68040: Upgrade2.0 doesn't install the 2.0 boot block Description The Upgrade2.0 application in Release 2.0 does not write the 2.0 boot block to the disk being upgraded. The boot block is the first piece of code that's loaded from the disk after you turn on the computer; it handles the reading of the Mach kernel from the disk and the initial execution of Mach. The 2.0 boot block supports 68040-based NeXT computers, as well as 68030-based NeXT computers; the 1.0 and 1.0a boot blocks support only 68030-based NeXT computers. If after running Upgrade2.0 you then install a 68040 upgrade CPU board, the machine will not boot. The symptoms of this are the following message: Exception 5 (0x14) 0xaddress You will see this during system start-up (address will be replaced by a PROM address). The message may be preceded by other error messages, including SCSI errors; these other messages may be ignored until after implementing the workaround, described below. After the Exception message is displayed, the system halts. Workaround After running Upgrade2.0, and before you reboot, run the Terminal application. If.. disk type: fixed_rw_scsi We recommend implementing this workaround even if you aren't upgrading to a 68040 now. That way, if upgrade later, your system will boot correctly after you install your new CPU board. If you have already tried to reboot, anabove steps. For More Information Contact NeXT Technical Support. ====================-- Pascal Chesnais, Research Specialist, Electronic Publishing Group Media Laboratory, E15-348, 20 Ames Street, Cambridge, Ma, 02139 (617) 253-0311 email: lacsap@plethora.media.mit.edu (NeXT)