55060d037f
of the old boot area so that 'disklabel -r -w' won't clobber anything, be sure to seek to the offset of the boot area (like readlabel() does). Otherwise, if the machine has code which looks up machine-dependent label bits, the offset read from will be incorrect, and disklabel will end up secretly replacing the boot area with other data (which probably doesn't look like a boot block). The only port this currently affects is NetBSD/arm32, because it's the only one of the three ports that use NUMBOOT > 0 that has MD label grovelling code.