We need to add some language to the Wiki describing how to use the `savedconfig` support in the kernel ebuild.  Here's the current procedure:

1. turn off `USE="binary"` and everything depending on it like `USE="-custom-cflags -logo -binary -luks -lvm" etc., by setting it in `/etc/portage/package.use/kernel` or similar:

$ echo "sys-kernel/debian-sources -binary -custom-cflags -logo -lvm -luks" | tee -a /etc/portage/package.use/debian-sources

1. turn on `USE="savedconfig"` as in step 1:

$ echo "sys-kernel/debian-sources savedconfig" | tee -a /etc/portage/package.use/debian-sources

1. install the sources but don't build the kernel (note that `N` corresponds to a number in the `eselect kernel list`:

$ emerge debian-sources
$ eselect kernel list
$ eselect kernel N

1. manually build the kernel and install the modules (important to do this before building the initramfs):

$ cd /usr/src/linux
$ make -j$(nproc) -l$(nproc)
$ make modules_install

1. manually build the initramfs with `genkernel` (if using `lvm`, `luks`, `mdadm` for `rootfs`, add options for them to the `genkernel` arguments):

genkernel initramfs --lvm --luks

1. finally, install the kernel:

make install

1. now update GRUB; after this it is safe to reboot if there are no errors:

ego boot update