Many thanks to Toby Weingartner for the help. The answer (once handed
\nto me on a silver platter) was dreadfully simple. Boot off a floppy,
\nand do “machine disk” at the boot prompt. Compare the results with and
\nwithout the drive attached. In my case the difference was just one line<\/p>\n
with pen drive
\n==============
\ndisk: fd0 fd1 hd0+ hd1+*
\n>> OpenBSD\/i386 BOOT 2.01
\nboot> machine disk
\nDisk BIOS# Type Cyls Heads Secs Flags Checksum
\nfd0 0x0 floppy 80 2 18 0x2 0x0
\nfd1 0x1 *none* 80 2 18 0x4 0x0
\nhd0 0x80 SCSI 63 255 63 0x2 0x8554854f
\nhd1 0x81 unknown 1022 240 63 0x0 0x34b5ae57<\/p>\n
without pen drive
\n=================
\ndisk: fd0 fd1 hd0+*
\n>> OpenBSD\/i386 BOOT 2.01
\nboot> machine disk
\nDisk BIOS# Type Cyls Heads Secs Flags Checksum
\nfd0 0x0 floppy 80 2 18 0x2 0x0
\nfd1 0x1 *none* 80 2 18 0x4 0x0
\nhd0 0x80 unknown 1022 240 63 0x0 0x34b5ae57<\/p>\n
Thus, you’d say something like “fdisk -c 63 -h 255 -c 63 -i sd0” and
\n“\/usr\/mdec\/installboot -h 255 -c 63 -v \/mnt\/boot \/usr\/mdec\/biosboot sd0”<\/p>\n
So now I have a shiny happy usb flash disk I can use to patch up bootblocks,
\nkeep crypto keys on, etc. Thanks Toby!<\/p>\n","protected":false},"excerpt":{"rendered":"
Many thanks to Toby Weingartner for the help. The answer (once handed to me on a silver platter) was dreadfully simple. Boot off a floppy, and do “machine disk” at the boot prompt. Compare the results with and without the … Read More »<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-92","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/92","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=92"}],"version-history":[{"count":0,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/92\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=92"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=92"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=92"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}