13 2012-03-27
Timezone

You first need to select your timezone so that your system knows where it is located. Look for your timezone in /usr/share/zoneinfo, then copy it to /etc/localtime. Please avoid the /usr/share/zoneinfo/Etc/GMT* timezones as their names do not indicate the expected zones. For instance, GMT-8 is in fact GMT+8. 

# ls /usr/share/zoneinfo
(Suppose you want to use Europe/Brussels)
# cp /usr/share/zoneinfo/Europe/Brussels /etc/localtime
(Next set the timezone)
# echo "Europe/Brussels" > /etc/timezone
Installing the Sources Choosing a Kernel

The core around which all distributions are built is the Linux kernel. It is the layer between the user programs and your system hardware. Gentoo provides its users several possible kernel sources. A full listing with description is available at the Gentoo Kernel Guide.

For -based systems we have gentoo-sources (kernel source patched for extra features).

Choose your kernel source and install it using emerge. 

# emerge gentoo-sources

When you take a look in /usr/src you should see a symlink called linux pointing to your kernel source. In this case, the installed kernel source points to linux-. Your version may be different, so keep this in mind. 

# ls -l /usr/src/linux
lrwxrwxrwx    1 root     root       12 Oct 13 11:04 /usr/src/linux -> linux-

Now it is time to configure and compile your kernel source.

Manual Configuration Introduction

Manually configuring a kernel is often seen as the most difficult procedure a Linux user ever has to perform. Nothing is less true -- after configuring a couple of kernels you don't even remember that it was difficult ;)

However, one thing is true: you must know your system when you start configuring a kernel manually. Most information can be gathered by emerging pciutils (emerge pciutils) which contains lspci. You will now be able to use lspci within the chrooted environment. You may safely ignore any pcilib warnings (like pcilib: cannot open /sys/bus/pci/devices) that lspci throws out. Alternatively, you can run lspci from a non-chrooted environment. The results are the same. You can also run lsmod to see what kernel modules the Installation CD uses (it might provide you with a nice hint on what to enable).

Now go to your kernel source directory and execute make menuconfig. This will fire up an ncurses-based configuration menu. 

# cd /usr/src/linux
# make menuconfig

You will be greeted with several configuration sections. We'll first list some options you must activate (otherwise Gentoo will not function, or not function properly without additional tweaks).

Activating Required Options

First, we set up the proper cross compilation settings to make sure that the Linux kernel is built for the correct system type. To do so, set the Cross-compiler tool prefix to sparc64-unknown-linux-gnu- (including the trailing dash): 

General setup --->
  (sparc64-unknown-linux-gnu-) Cross-compiler tool prefix

Then go to File Systems and select support for the filesystems you use. Don't compile them as modules, otherwise your Gentoo system will not be able to mount your partitions. Also select Virtual memory and /proc file system: 

File systems --->
  Pseudo Filesystems --->
    [*] /proc file system support
    [*] Virtual memory file system support (former shm fs)

(Select one or more of the following options as needed by your system)
  <*> Ext3 journalling file system support
  <*> Second extended fs support

If you are using PPPoE to connect to the Internet or you are using a dial-up modem, you will need the following options in the kernel: 

Device Drivers --->
  Network device support --->
    <*> PPP (point-to-point protocol) support
    <*>   PPP support for async serial ports
    <*>   PPP support for sync tty ports

The two compression options won't harm but are not definitely needed, neither does the PPP over Ethernet option, that might only be used by ppp when configured to do kernel mode PPPoE.

Now activate the correct bus-support: 

Console drivers --->
  Frame-buffer support --->
    [*] SBUS and UPA framebuffers             
      [*] Creator/Creator3D support     (Only for UPA slot adapter used in many Ultras)
    [*] CGsix (GX,TurboGX) support      (Only for SBUS slot adapter used in many SPARCStations)

Of course you want support for the OBP: 

Misc Linux/SPARC drivers --->
  [*]  /dev/openprom device support

You will also need SCSI-specific support: 

SCSI support --->
  SCSI low-level drivers --->
    <*> Sparc ESP Scsi Driver             (Only for SPARC ESP on-board SCSI adapter)
    <*> PTI Qlogic, ISP Driver            (Only for SBUS SCSI controllers from PTI or QLogic)
    <*> SYM53C8XX Version 2 SCSI support  (Only for Ultra 60 on-board SCSI adapter)

To support your network card, select one of the following: 

Network device support --->
  Ethernet (10 or 100Mbit) --->
    <*> Sun LANCE support                   (Only for SPARCStation, older Ultra systems, and as Sbus option)
    <*> Sun Happy Meal 10/100baseT support  (Only for Ultra; also supports "qfe" quad-ethernet on PCI and Sbus)
    <*> DECchip Tulip (dc21x4x) PCI support (For some Netras, like N1)
  Ethernet (1000Mbit) --->
    <*> Broadcom Tigon3 support (Modern Netra, Sun Fire machines)

When you have a 4-port Ethernet machine (10/100 or 10/100/1000) the port order is different from the one used by Solaris. You can use sys-apps/ethtool to check the port link status.

If you're using a qla2xxx disk controller, you'll need to use a 2.6.27 kernel or newer, and you'll also need to emerge sys-block/qla-fc-firmware. Next, run make menuconfig and navigate to the Device Drivers section. You'll need to add support for loading external firmware. 

Device Drivers  --->
   Generic Driver Options  --->
   ()  External firmware blobs to build into the kernel binary
   ()  Firmware blobs root directory

Set "External firmware blobs" to ql2200_fw.bin and "Firmware blobs root directory" to /lib/firmware.

When you're done configuring your kernel, continue with Compiling and Installing. However, after having compiled the kernel, check its size: 

# ls -lh vmlinux
-rw-r--r--    1 root     root         2.4M Oct 25 14:38 vmlinux

If the (uncompressed) size is bigger than 7.5 MB, reconfigure your kernel until it doesn't exceed these limits. One way of accomplishing this is by having most kernel drivers compiled as modules. Ignoring this can lead to a non-booting kernel.

Also, if your kernel is just a tad too big, you can try stripping it using the strip command: 

# strip -R .comment -R .note vmlinux
Compiling and Installing

Now that your kernel is configured, it is time to compile and install it. Exit the configuration and start the compilation process: 

# make && make modules_install

When the kernel has finished compiling, copy the kernel image to /boot. 

# cp arch/sparc/boot/image /boot/

Now continue with Kernel Modules.

Kernel Modules