Karel Zak wrote:
On Tue, Oct 03, 2017 at 11:57:06AM -0500, Bruce Dubbs wrote:
I have been having a problem with fdisk on old computers.
What I am doing is installing Debian, but dropping to the command line and
creating a GPT manually because Debian seems to want to always create a
msdos partition table.
After creating the GPT and partitioning, the install proceeds normally, but
upon reboot the old bios tells me "No bootable disk".
I can fix this by going into rescue mode and setting the pmbr_boot flag
using parted.
My question is whether this can be done in fdisk. If not, can it be added?
I did try going into expert mode and selecting "toggle the legacy BIOS
bootable flag", but does not seem to work. I did not see any change to the
boot sector when using 'd: print the raw data of the first sector from the
device'.
The tricky thing is that fdisks by default see GPT partition, so you
have to force the tools to ignore GPT and use PMBR. There is more
ways:
2) start fdisk as usually
- go to expert mode ('r')
There is not an 'r' mode, only 'x' when the current table is gpt.
- see help ('m')
- switch to nested label ('M')
- go to main menu ('r')
- toggle boot flag ('a')
- write ('w')
I wasn't sure if the 'pmbr_boot' flag was just the standard mbr boot flag
for partition 1 or not. Would it be reasonable to set that flag by
default when 'g create a new empty GPT partition table' is selected?
-- Bruce
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