These are some notes to elaborate on acronyms and terms used in this document.

When mentioning SPARC and SPARC64, this refers to the type of sun4x system. SPARC represents the 32 bit systems using the sun4c, sun4d and sun4m architectures (i.e. SPARCstations). SPARC64 represents the sun4u architecture seen in the UltraSPARC series of systems (Ultras, Blades, SunFires, etc).

Acronyms: OBP = OpenBoot PROM, SS = SPARCstation.

First, make sure you do not have a keyboard and monitor plugged in. OBP will use the monitor for output by default if either are plugged in. You will need a null modem cable or a regular serial cable with a null modem adapter to be able to view output.

Standard serial port settings:

• 9600 baud
• 8 data bits
• None for parity
• 1 stop bits

Below is a list of commonly used programs for viewing a serial console. Check to see if your serial console application has the ability to send a break, as it can be very useful on a SPARC. The break signal on a serial console is the equivalent to issuing the Stop+A command on the keyboard.

Currently, Gentoo has experimental network boot/tftpboot images available on a local Gentoo mirror in experimental/sparc/tftpboot. Get the appropriate image for your SPARC computer and then proceed to the Netboot HOWTO for further instructions.

This problem is a result of the framebuffer support the Linux kernel loads at boot time, and the modelines available on SPARC systems. Here we will assume your monitor and video card will agree on a resolution of 1024 by 768 at a refresh rate of 60 Hz. In OBP, you can set the resolution by adjusting the setting for output-device. To view the current setting, use the command:

ok printenv output-device

<output-device>        <screen>          <screen>

Now, to set this so it will start the display using the above mentioned resolution, we will use the setenv command as follows:

ok setenv output-device screen:r1024x768x60

output-device =       screen:r1024x768x60

In order for this to take effect, you will need to reset the machine:

ok reset

Additionally, for users using the onboard video card based on the ATI Mach64 chipset (Ultra 5/10 and Blade 100/150), you will want to append the following to your kernel boot options:

video=atyfb:1024x768@60

If you are booting from SILO, you can append the above string onto the end of a given boot image. The following example would be if you were booting from the LiveCD.

boot: gentoo video=atyfb:1024x768@60

If you were booting from the network, you would append the string onto the end of the boot net command in OBP as illustrated below:

ok boot net video=atyfb:1024x768@60

Most of the time, the default kernel options will be acceptable for hardware support. You will need to make sure that devfs and virtual memory filesystem support is enabled in the kernel as instructed in the Installation Handbook.

Additionally, Gentoo/SPARC developer Ciaran McCreesh maintains a collection of kernel configuration files for various SPARC systems at http://dev.gentoo.org/~ciaranm/configs/kernel/. Feel free to submit kernel configuration files for any SPARC systems and/or kernel versions not currently avaiable to ciaranm@gentoo.org.

Dual booting Gentoo Linux/SPARC and Solaris can be done one of two ways. The two ways are: having both Gentoo Linux/SPARC and Solaris on the same drive, or having them on separate drives. Below are example SILO configurations for each scenario. In the example configs, the following things are assumed:

Single Drive Setup:

• Boot drive is SCSI ID 0
• Gentoo boots from partition 1
• Solaris boots from parition 5

Separate Drive Setup:

• Second drive is SCSI ID 1
• Gentoo is on SCSI ID 0
• Solaris is on SCSI ID 1
• boot-device in OBP is SCSI ID 0

# Generic config options
partition = 1
timeout = 50

# Gentoo Linux/SPARC options
image = /boot/vmlinux
    label = linux
    root=/dev/sda4

# Solaris options
other=5
    label = Solaris

# Generic config options
parition = 1
timeout = 50

# Gentoo Linux/SPARC options
image = /boot/vmlinux
    label = linux
    root=/dev/sda4

# Solaris options
other = /sbus/espdma/esp/sd@1,0;1
	  label = solaris

One possibility has to do with the way the that the SCSI IDs are assigned. Gentoo/SPARC developer Keith Wesolowski provides us with the following:

Linux, normally, orders devices by SCSI ID. The lowest-numbered disk is sda, the next-lowest is sdb, and so on. Note that devfs allows you to specify devices by SCSI ID, so that adding a new device doesn't cause your existing devices to be renamed, unless of course you use the compatibility names. There are additional ways to solve this.

The OBP in most or all sun4c and sun4m systems aliases "disk" to the device with SCSI ID 3, and "disk0" through "disk3" to the device with = the corresponding SCSI ID, if it happens to be a disk rather than a tape, CDROM, etc.

In the desktop systems of this era that support two SCA disks (the Aurora chassis systems), the lower slot is assigned SCSI ID 3, and the upper slot is assigned SCSI ID 1.

If you like, you can change the PROM alias "disk" to match that of "disk1" so that the boot disk command causes the system to boot from the same device Linux calls sda. This feels more consistent and normal, especially for users with a PC background. Alternatively, you can simply place the filesystem containing /boot (which could be the root filesystem or a separate boot filesystem) on device ID 3 (Linux sdb) and boot from it, using a root filesystem on either sda or sdb, or in fact any other disk attached to the system.

It depends on the type of SPARC, but chances are yes. One exception seems to be the SPARC based laptops from Tadpole, particularly the newer models. If you have a working Tadpole on Gentoo/SPARC, please contact us and let us know the details on the model and anything special needed to get it to work.

Gentoo/SPARC Developer Todd Sunderlin keeps a partial list of the status of SPARC64 systems under Gentoo at http://dev.gentoo.org/~todd/sparc64.html. Email him with any additions or possible changes to todd@gentoo.org.

To add details on your model SPARC64 to the list, email todd@gentoo.org with the pertinent information. In general, support for the SPARC64 systems is good enough to allow some users to run it successfully in production environments.

32-bit SPARC systems vary. Systems with the sun4m architecture have been reported to work fine (SS4-SS20) including SMP configurations with the later 2.4 series kernels. sun4m systems using HyperSPARC or Ross processors in a SMP configuration will have a lot of kernel related trouble. Additionally the author hasn't heard of any user reports in regards to the JavaStations so its status is unknown. sun4d based systems currently do not work in the 2.4 kernel series, and sun4c has been unstable as well.

Often, the problems encountered in trying to run Gentoo on a 32-bit SPARC system stem from the kernel. Rob Radez (not related to Gentoo) maintains a webpage http://osinvestor.com/sparc/ with the status of SPARC system support for various versions of the Linux kernel. This can help indicate how usable your SPARC system would be under SPARC/Linux.

For a list of additionally supported Sun hardware, consult the following list from the UltraLinux homepage - http://www.ultralinux.org/faq.html#q_2_2.

A partial list of Sun devices which do NOT currently have support under Gentoo/SPARC or SPARC/Linux in general are:

• SunPCI cards
• SBUS or PCI PCMCIA controllers
• Smart card readers on some Sun Blade workstations
• Floppy drive on some Sun Blade workstations

Also, Gentoo/SPARC developer Sven Blumenstein keeps a list of PC hardware that has been tested with the PCI based SPARC64 systems at http://dev.gentoo.org/~bazik/hw.php. Feel free to add your results at testing PC or non-Sun hardware to the list by emailing bazik@gentoo.org with the information on the hardware as displayed in the existing hardware list.

The UltraLinux FAQ has the answer at http://www.ultralinux.org/faq.html#q_2_1.

The ATI Framebuffer normally expects a PC's BIOS to set the Reference Clock speed for the video card. However, on non-x86 architectures, this doesn't happen. So what needs to be done is to set the Reference Clock speed in the XF86Config file.

In the "Device" section of your XF86Config file, you will want to add a line similar to the following:

Option      "reference_clock"   "28.636 MHz"

The following URLs contain more information on how to set the reference clock: http://www.xfree86.org/~dawes/4.3.0/ati5.html#26.

Chances are this is due to the fact that none of the Gentoo/SPARC developers have gotten around to testing this yet, and/or the package is currently marked with the ~sparc keyword (meaning it's in a testing phase).

If you still want to install the package, you can follow the instructions from the at Portage Masked Package FAQ.

If you want to help ensure a package gets marked stable in a timely fashion, particularly if it's an application with a small userbase (i.e. net-im/bitlbee), install the package and test to make sure it works. If it appears to be working well, feel free to file a bug at http://bugs.gentoo.org and assign it to the Gentoo/SPARC team.

This is a bug. Please file a bug report at http://bugs.gentoo.org for the Gentoo/SPARC team indicating what package you tried to emerge, the error message emerge gave you, and the output of emerge info.

The best way is to join the #gentoo-sparc IRC channel on Freenode IRC network irc.freenode.net. This is where all of the developers hang out and talk SPARC (amongst other things). Short of email, this is the best way to get our attention, and blame seemant! :)

Also, many users and developers make use of the Gentoo/SPARC forum. This is a good place to ask questions and see what problems have come up before, as well as talk shop about Gentoo/SPARC.

Additionally, you can view the bugs for Gentoo/SPARC via the Gentoo Bugzilla. The bugs will be assigned or CC'd to sparc@gentoo.org.

A list of problematic packages can be found at http://dev.gentoo.org/~weeve/problems.html

Here is some info on the Gentoo/SPARC project itself:

• Gentoo/SPARC Project Page
• #gentoo-sparc - Official IRC channel on irc.freenode.net
• Gentoo/SPARC Forum
• sparc@gentoo.org - Gentoo/SPARC team email address

Here are links to additional information about SPARC/Linux or SPARCs in general:

• UltraLinux Homepage - Homepage of the SPARC/Linux port
• Sunsolve - Great resource for Sun hardware documentation
• http://docs.sun.com - Additional hardware and software information for SPARC systems, including instructions for flashing OBP
• Obsolyte - Information on older SPARC systems and links to a lot of other great SPARC related sites.
• Unofficial Sun Blade 100 FAQ - Answers a lot of hardware related questions on the Blade 100
• OBP Reference Guide - Sun's guide to the OpenBoot PROM.