On 18.01.2019 22:35, Rodney W. Grimes wrote: >>> errm.. you press a key and enter device and or loader path. if it is not >>> working - the code is there to be fixed. >> And loader looks to "bootme" attribute and try to boot from partition >> which has one, even if it is loaded from other partition itself. >> >>> GPT does not have the concept of active partition. >> It has "bootme" / "bootonce" attributes. And [zfs]gptboot doesn't have >> any tools to set these attributes, AFAIK. Same for UEFI boot code. > > The gpart(8) command is used to set/unset these. gpart need booted system. NanoBSD typically have two "system" partitions, "old" (previous) and "new" (current). After upgrade they switched (new code is written to "previos" partition and bootable atteibute is set to it, "active" in case of MBR and "bootme" in case of GPT).
If this new partition has problems and could not be booted, it is hard to boot from "old" (previous) one. MBR + boot0 could (interactively) change active partition before system is booted, and this problem could be solved with one keypress: you select old partition on boot. -- // Lev Serebryakov
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