| 1 |
Am Mittwoch, 10. Dezember 2008 19:53:10 schrieb Harry Putnam: |
| 2 |
> I happen to be stuck with a machine using an initramfs. Every of attempt |
| 3 |
> of mine to build a new kernel not using an initram (Or even with initram) |
| 4 |
> has failed with the boot routine failing to recognize my /dev/sdb3 as root. |
| 5 |
|
| 6 |
What is the error message you get? |
| 7 |
|
| 8 |
> Its a gentoo vmappliance running on windows xp pro. |
| 9 |
> |
| 10 |
> I'm not asking about getting the kernel right this time... I have in other |
| 11 |
> threads. I just want to know more about invoking the intramfs. |
| 12 |
> |
| 13 |
> I know what needs to go in grub just by coping what is there originally in |
| 14 |
> the vmware but I'm wondering: |
| 15 |
> |
| 16 |
> If you wanted to use something like vesa_fb... I know the incantations for |
| 17 |
> the kernel line: |
| 18 |
> |
| 19 |
> Since that is how I boot my main gentoo desktop: |
| 20 |
> |
| 21 |
> /kernel bla-222 root=/dev/hda5 vga=0x31A video=vesafb:mtrr,ywrap |
| 22 |
> |
| 23 |
> On that machine I use no intramfs. |
| 24 |
> |
| 25 |
> But when booting from initramfs where would that kind of stuff go. Or is |
| 26 |
> it made useless by booting from intramfs. |
| 27 |
|
| 28 |
It just stays where it is. |
| 29 |
|
| 30 |
> Would the `vga=0x31A video=vesafb:mtrr,ywrap' go on the kernel line still |
| 31 |
> or on the `initrd' line. |
| 32 |
|
| 33 |
The above is just the kernel command line, options you can pass just as you |
| 34 |
would for any command when the system is running. The initrd line just tells |
| 35 |
grub where to find the initrd and how it's named. BTW: You can compile the |
| 36 |
initramfs into the kernel, so that this extra line isn't even needed. |
| 37 |
|
| 38 |
> As you see I don't really understand what is happening there. |
| 39 |
> Reading that part of the handbook, it kind of skips over that. Gives |
| 40 |
> direction for kernel and for initramfs but doesn't say what to do with VESA |
| 41 |
> stuff if you boot from initrd. |
| 42 |
|
| 43 |
See above. Both are completely different things. |
| 44 |
|
| 45 |
Why do you think you need an initramfs at all? It's usually only needed in |
| 46 |
very rare cases where either a driver for storage hardware is needed which is |
| 47 |
not part of the kernel itself or some user space things need to be done to |
| 48 |
even setup the root device before the system can be booted from it (i.e. when |
| 49 |
it's encrypted). |
| 50 |
|
| 51 |
However, to get a better understanding about initramfs and how it works, you |
| 52 |
should read Documentation/early-userspace/README in the kernel source tree. |
| 53 |
|
| 54 |
HTH... |
| 55 |
|
| 56 |
Dirk |
Archives