I’ve been trying to install Gentoo linux as a guest on OSX using Vmware Fusion, After configuring the kernel, booting the system resulted:

Using the Gentoo minimal bootable disc, we can identify what SCSI storage controller we have:

lspci |grep -i scsi
00:10.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 01)

The Ultra 320 controller requires Fusion-MPT support in the kernel, that is located under:

Device Drivers -> Fusion MPT device support - Fusion MTP ScsiHost drivers for SPI

Don’t forget to:

make;make install;grub-mkconfig /dev/sda

Also note that although Gentoo handbook defines initramfs is an optional it is mandatory for MTP to work properly.

For more info, please refer to: http://wikigentoo.ksiezyc.pl/HOWTO_Install_Gentoo_on_VMware.htm#2.6.x_Kernel_Configuration

Re-install the kernel and reboot.