Hi, I think I've at last found a bug in elfboot.c. Until this fix, I had always needed to disable verify code in elfboot.c to get it work. Now it boots ELF kernel with BOOT_IDE perfectly. One of doubly-linked chain was not initialized. I think it did not cause problem when memory near address 0 comes up with zeroes. But my raminit.inc leaves gabages there so some bogus memory ranges have been included in checksum. -- Takeshi Index: src/lib/elfboot.c =================================================================== RCS file: /cvsroot/freebios/freebios/src/lib/elfboot.c,v retrieving revision 1.15 diff -u -r1.15 elfboot.c --- src/lib/elfboot.c 10 Oct 2002 22:23:43 -0000 1.15 +++ src/lib/elfboot.c 30 Jun 2003 18:11:26 -0000 @@ -368,6 +368,7 @@ int i; memset(head, 0, sizeof(*head)); head->next = head->prev = head; + head->phdr_next = head->phdr_prev = head; for(i = 0; i < headers; i++) { struct segment *new; /* Ignore data that I don't need to handle */