{"id":5,"date":"2008-07-15T17:17:50","date_gmt":"2008-07-15T21:17:50","guid":{"rendered":"http:\/\/www.braindeadprojects.com\/blog\/?p=5"},"modified":"2009-05-18T16:17:17","modified_gmt":"2009-05-18T20:17:17","slug":"uml-block-device-issues","status":"publish","type":"post","link":"http:\/\/www.braindeadprojects.com\/blog\/usermode-linux\/uml-block-device-issues\/","title":{"rendered":"UML Block Device Issues"},"content":{"rendered":"

I spent about half an hour the other day trying to figure out why a new Usermode Linux 2.6 kernel wouldn’t boot. Most of the time I focus on the 2.4 kernels, since adding “TTY Logging” to that kernel is really <\/em>easy. (Yes, I’m watching your every keystroke)<\/p>\n

For some reason, every time I’d boot the kernel, I’d get:<\/p>\n

“Kernel Panic – VFS: Cannot open root device “98:0” or unknown-block<\/em>“<\/p><\/blockquote>\n

The obvious problem would have been misspelling the flag “ubd” “udb”… but that wasn’t it. After scouring the Internet for any help I could find (and coming up empty), it turns out I missed a really simple but necessary config option when compiling the kernel:<\/p>\n

“CONFIG_BLK_DEV_UBD” – Don’t leave home without it.<\/p>\n","protected":false},"excerpt":{"rendered":"

I spent about half an hour the other day trying to figure out why a new Usermode Linux 2.6 kernel wouldn’t boot. Most of the time I focus on the 2.4 kernels, since adding “TTY Logging” to that kernel is really easy. (Yes, I’m watching your every keystroke) For some reason, every time I’d boot … Continue reading UML Block Device Issues<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-5","post","type-post","status-publish","format-standard","hentry","category-usermode-linux"],"_links":{"self":[{"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/posts\/5"}],"collection":[{"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/comments?post=5"}],"version-history":[{"count":2,"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/posts\/5\/revisions"}],"predecessor-version":[{"id":48,"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/posts\/5\/revisions\/48"}],"wp:attachment":[{"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/media?parent=5"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/categories?post=5"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.braindeadprojects.com\/blog\/wp-json\/wp\/v2\/tags?post=5"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}