genkernel bootloader=grub all

 ~ # genkernel --bootloader=grub all
* Gentoo Linux Genkernel; Version 3.4.24_p2
* Running with options: --bootloader=grub all

* Linux Kernel 3.3.8-gentoo for x86...
mount: special device /dev/sda1 does not exist
* WARNING: Failed to mount /boot!

* kernel: Using config from /etc/kernels/kernel-config-x86-3.3.8-gentoo
*         Previous config backed up to .config--2012-09-18--10-49-43.bak
* kernel: >> Running mrproper...
*         >> Running oldconfig...
* kernel: >> Cleaning...
*         >> Compiling 3.3.8-gentoo bzImage...
*         >> Not installing firmware as it's included in the kernel already (CONFIG_FIRMWARE_IN_KERNEL=y)...
*         >> Compiling 3.3.8-gentoo modules...
* Copying config for successful build to /etc/kernels/kernel-config-x86-3.3.8-gentoo
* blkid: >> Using cache
* busybox: >> Using cache
* initramfs: >> Initializing...
*         >> Appending base_layout cpio data...
*         >> Appending auxilary cpio data...
*         >> Appending busybox cpio data...
*         >> Appending modules cpio data...
*         >> Appending blkid cpio data...
* Adding kernel to /boot/grub/grub.conf...
awk: fatal: cannot open file `/var/tmp/genkernel/19542.24954.16764.18760/grub.map' for reading (No such file or directory)
* Error! /boot/grub/grub.conf does not exist and the correct settings can not be automatically detected.
* Please manually create your /boot/grub/grub.conf file.
*
* Kernel compiled successfully!
*
* Required Kernel Parameters:
*     real_root=/dev/$ROOT
*
*     Where $ROOT is the device node for your root partition as the
*     one specified in /etc/fstab
*
* If you require Genkernel's hardware detection features; you MUST
* tell your bootloader to use the provided INITRAMFS file. Otherwise;
* substitute the root argument for the real_root argument if you are
* not planning to use the initramfs...

* WARNING... WARNING... WARNING...
* Additional kernel cmdline arguments that *may* be required to boot properly...
* With support for several ext* filesystems around it may be needed to
* add "rootfstype=ext3" or "rootfstype=ext4"

* Do NOT report kernel bugs as genkernel bugs unless your bug
* is about the default genkernel configuration...
*
* Make sure you have the latest ~arch genkernel before reporting bugs.