cannot boot in kernel 2.6.27.2 in debian-40r4a (2.6.18)

["lovecreatesbeauty@gmail.c0m" <lovecreatesbeauty@gmail.com>]

I compile, install and boot with linux-2.6.26.3 in debian-40r4a
(2.6.18) hosted in VMware Workstation 6 successfully (I failed on
VMware Workstation 5 with the same kernel and debian and got the
BusyBox message) with the following steps:

	$ bzip2 -dc linux-2.6.26.3.tar.bz2 | tar xvf -
	$ cd linux-2.6.26.3
	$ make mrproper
	$ make defconfig
	$ make
	$ su -c 'make install'
	$ su -c 'make modules_install'
	$ su -c 'update-initramfs -c -k 2.6.26.3'

And following five lines in /boot/grub/menu.lst:

	title		Debian GNU/Linux, kernel 2.6.26.3
	root		(hd0,0)
	kernel		/boot/vmlinuz-2.6.26.3 root=/dev/sda1 ro
	initrd		/boot/initrd.img-2.6.26.3
	savedefault

I can compile kernel 2.6.27.2 with same steps in the same environment,
but cann't boot in 2.6.27.2 and fall into the BusyBox trap:

	Begin: Waiting for root file system... ...
	Done.
	    Check root= bootarg cat /proc/cmdline
	    or missing modules. devices: cat /proc/modules ls /dev
	ALERT! /dev/sda1 does not exist. Dropping to a shell!
	BusyBox v1.1.3 (Debian 1:1.1.3-4) Built-in shell (ash)
	Enter `help' for a list of built-in commands.

	/bin/sh: can't access tty; job control turned off
	(initramfs) _