[bug #42029] insmod ahci clears all detected devices

[benok]

Follow-up Comment #4, bug #42029 (project grub):

Thanks about biosnum.
I tried to set biosnum like below, but no success :-(

In reference, https://www.gnu.org/software/grub/manual/html_node/biosnum.html

>When chain-loading another boot loader (see Chain-loading), 
>GRUB may need to know what BIOS drive number corresponds to 
>the root device (see root) so that it can set up registers properly.

So I searched "BIOS drive number" and got pages below.

http://stackoverflow.com/questions/11174399/pc-boot-dl-register-and-drive-number

I tried following sequence where XXXX=0x80, 0x81, 128, 129, 130, 0, 1, 2, but
failed to boot.
(0x81, 129 gives no error display and halt, other gives "boot error".)


grub> nativedisk 
error: no device connected. 
error: disk `hd0,gpt1' not found. 
error: disk `hd0,gpt1' not found. 
grub> ls 
(ahci3) (ahci2) (ahci1) (ahci0) (ahci0,msdos1) (ata0) (ata0,gpt3) 
(ata0,gpt2) (ata0,gpt1) (ata2) 
grub> set root=ahci0,msdos1 
grub> set biosnum=XXXX
grub> chainloader +1 
grub> boot 



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