Now I have installed the Gentoo on my MBP succesfully,I need to record some issues that I have solved.

localhost ~ # lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:01.1 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Universal Host Controller #5 (rev 05)
00:1a.7 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Universal Host Controller #1 (rev 05)
00:1d.7 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 05)
00:1f.2 IDE interface: Intel Corporation 6 Series/C200 Series Chipset Family 4 port SATA IDE Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Whistler [AMD Radeon HD 6600M Series]
01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Turks HDMI Audio [Radeon HD 6000 Series]
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM57765 Gigabit Ethernet PCIe (rev 10)
02:00.1 SD Host controller: Broadcom Corporation NetXtreme BCM57765 Memory Card Reader (rev 10)
03:00.0 Network controller: Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02)
04:00.0 FireWire (IEEE 1394): Agere Systems FW643 PCI Express 1394b Controller (PHY/Link) (rev 08)

03:00.0 Network controller: Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02)

Thought I have followed the directions of the kernel document,but it still can't find the wireless card,after the google search ,it must enable the following options for the kernel

Device Drivers->Broadcom specific AMBA->
                   < *> BCMA Support
                    [*] Support for BCMA on PCI-host bus

And you can find the firmware in the

 ls /lib/firmware/b43/
 
 

Add the hda-intel to /etc/make.conf

ALSA_CARDS="hda-intel"

And config the kernel options fo intel hda,after these I think it should work well,but wtf,it is no sound.I almost use alsa-mixer to set all the values to the largest,but useless.

Then one day,I use the System→Volume Control,I found some settings are set to mute,that is the problem,after correct,it works well,so strange.

Refer to http://www.gentoo.org/doc/en/alsa-guide.xml

emerge alsa-utils
rc-update add alsasound boot
gpasswd -a <username> audio 

When I upgrade the kernel to 3.3.8,it can't startx correctly,after google search,need do the aticonfig to generate the /etc/X11/xorg.conf:

aticonfig --initial

http://ck.kennt-wayne.de/2012/jun/gentoo-linux-on-the-macbook-pro-82-late-2011

Touchpad:The touchpad works flawlessly with xf86-input-mtrack.

http://dentifrice.poivron.org/laptops/macbookpro8,2/

emerge x11-drivers/xf86-input-mtrack

Append section to /etc/X11/xorg.conf

Section "InputClass"
	 MatchIsTouchpad "true"
	 Identifier      "Touchpads"
	 Driver          "mtrack"
 EndSection

.Xmodmap

pjq@localhost ~ $ cat .Xmodmap 
pointer = 1 2 3 5 4 7 6 8 9 10 11 12

1.Of course,first should install rEFIt,and sync the MBR partition list. 2.Fix the grub command,it is really strange,after the new install of Mac OS X,the sda5 has been changed to sda4:

splashimage=(hd0,3)/boot/grub/splash.xpm.gz

title Gentoo Linux root (hd0,3) root=/dev/sda4 /boot/kernel-3.3.8 
root (hd0,3)
kernel /boot/kernel-3.3.8 root=/dev/sda4

title Gentoo Linux root (hd0,4) root=/dev/sda5 /boot/kernel-3.3.8 
root (hd0,4)
kernel /boot/kernel-3.3.8 root=/dev/sda5

And the fstab also need update:

# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/sda4              /           ext4            noatime         0 0
#/dev/sda4 /boot		ext2		noauto,noatime	1 2
/dev/sda3		/home		ext4		noatime		0 1
#/dev/SWAP		none		swap		sw		0 0
/dev/cdrom		/mnt/cdrom	auto		noauto,ro	0 0
/dev/fd0		/mnt/floppy	auto		noauto		0 0