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<p>or our various mirror sites, in the directory:</p>
<p>.../Updates/DR2.1update5/</p>
<p>(Please be patient with the mirror sites, it may take them some time to<br />
mirror the update)</p>
<p>*** IMPORTANT NOTES ****</p>
<p>General</p>
<p>This update consists of a new Microkernel, Linux Server, Default Pager, and<br />
MkLinux Booter. Unlike updates 3 and 4, there are no new RPM (Redhat<br />
Package Manager) packages to download and install. There have been newer<br />
versions of some of the shared library based RPMs made available since<br />
update 4, as well as many shared library based RPMs that weren't part of<br />
updates 3 and 4. However, they are not part of this update. You may obtain<br />
them separately from ftp.linuxppc.org and its mirrors.</p>
<p>The sources to the Microkernel, Default Pager, and Linux Server, as well as<br />
the tools and instructions needed to build them, are included for those of<br />
you interested. However, there is no requirement to rebuild these<br />
components in order to apply the update.</p>
<p>Upgrade Path</p>
<p>This is an update to MkLinux DR2.1. If you are still running MkLinux DR1,<br />
DR2, or DR2 with updates, then you should upgrade to DR2.1 before applying<br />
this update.</p>
<p>It is easiest if you apply this update to a system that has already been<br />
updated to the previous level, DR2.1update4. However, it is possible to<br />
skip updates if you follow the instructions in the file README.install.</p>
<p>Here's a summary:</p>
<p>From: To: Valid:<br />
----- --- ------<br />
DR2.1update4 -) DR2.1update5 (YES)<br />
DR2.1update3 -) DR2.1update5 (YES) *<br />
DR2.1update2 -) DR2.1update5 (YES) *<br />
DR2.1update1 -) DR2.1update5 (YES) *<br />
DR2.1 -) DR2.1update5 (YES) *<br />
DR2 -) DR2.1update5 (NO)<br />
DR1 -) DR2.1update5 (NO)</p>
<p>* Note: When updating a DR2.1, DR2.1update1, DR2.1update2, or DR2.1update3<br />
system to this update (DR2.1update5), you will need to apply the pieces<br />
from this update (the kernel, server, default pager, and booter) and then<br />
bring the shared libraries on your system up to the "DR2.1update4" level.<br />
See the file README.install for more information.</p>
<p>Bug Fixes</p>
<p>We believe this update fixes the following bugs.</p>
<p>- All the memory in large memory machines can now be used. In previous<br />
updates, people with more than about 90 Mb of ram had to limit their memory<br />
by using the "-m" mach option. The "-m" option still works. However, you<br />
should now remove the "-m" option if you used it in the past. NOTE: take<br />
care to keep the Linux server from using more memory than it can handle,<br />
see the Enhancements section below.</p>
<p>- The saved MacOS timezone is now used by the microkernel to determine its<br />
own time, which is in GMT. The Linux server's time is then derived from the<br />
microkernel's time.</p>
<p>- On PCI machines, the bus speed is properly detected. The previous<br />
workaround, mach option "bus_speed_hz", no longer does anything.</p>
<p>- On PCI machines, the video card (ATI or IMS Twin Turbo) is properly<br />
detected. The previous workaround, mach option "video_probe", no longer<br />
does anything.</p>
<p>- There are fixes in signal handling that were causing problems with the<br />
JDK (Java Development Kit).</p>
<p>Enhancements</p>
<p>- New MkLinux Booter<br />
- Ability to boot with MacOS's VM on<br />
- Passes open firmware device tree to Microkernel<br />
- Can default boot into MkLinux or MacOS<br />
- NOTE: This Booter will not work with any Mach Kernel<br />
prior to the one in DR2.1update5.</p>
<p>- The IMS Twin Turbo video card now works properly.</p>
<p>- Audio now works on PCI based Macs.<br />
- You'll notice that there is now an audible "beep" on these machines.<br />
- Audio recording isn't available yet.<br />
- Audio support for the NuBus Macs (6100/7100/8100] is not in this<br />
update. We expect to have it working on these machines soon.<br />
- There is a nice utility called wavplay that will play ".wav" files.<br />
You can retrieve it from <a href="ftp://ftp.linuxppc.org/linuxppc/redhat/RPMS/ppc/" title="ftp://ftp.linuxppc.org/linuxppc/redhat/RPMS/ppc/">ftp://ftp.linuxppc.org/linuxppc/redhat/RPMS/ppc/</a></p>
<p>- Improved disk I/O performance. Swapping/Paging performance has<br />
been improved as well.</p>
<p>- Real SPL's have been implemented on the PCI Powermacs. This helps<br />
balance the I/O load placed on a system. It is also more of the<br />
groundwork being put in place for future SMP capability.</p>
<p>- Additions to the /proc filesystem. In /proc/osfmach3/ there are some<br />
more entries describing what's going on inside Mach. /proc/scsi/scsi<br />
is now present and contains useful information.</p>
<p>- Now uses the same kernel loadable modules as Linux/PPC.</p>
<p>- A second segment register was added to the collocated server space. This<br />
means that the Linux server can map up to 512M when collocated.<br />
NOTE: for systems with more than 160M of RAM, you should change a line<br />
in your /mach_servers/bootstrap.conf file so that the Linux server<br />
doesn't grow bigger than it thinks it can handle. The line you will<br />
Make this change _before_ you remove the "-m" option from your lilo.conf,<br />
if you had used -m in the past.</p>
<p>- HFS filesystem support built in to Linux server and bootstrap task.</p>
<p>- The standard Linux little-endian ext2 support is built into the Linux<br />
server and bootstrap task. (Naturally, big-endian "ext2" is still<br />
available in this update.)</p>
<p>Known Problems</p>
<p>- When booting with MacOS's VM turned on, some machines exhibit a<br />
noticible delay between the "System Booting..." message, and the<br />
first screen clear by the Microkernel. You may need to wait a few<br />
seconds.</p>
<p>- This isn't really a problem, but most likely some people will<br />
run into this. You _must_ update the "MkLinux Booter" as well<br />
as the "Mach Kernel" in your Extensions folder. Any previous<br />
Booter will not work with the new Mach Kernel provided in this<br />
update. And vice-versa, any previous Mach Kernel will not work<br />
with the MkLinux Booter provided in this update.</p>
<p>- Another "this isn't really a problem" about the "MkLinux Booter"<br />
"Mach Kernel". These two files have very specific names and things will<br />
_not_ work properly if they don't have the correct names. The new booter<br />
_must_ have the name "MkLinux Booter" (with the space and without the<br />
quotes). The new microkernel _must_ have the name "Mach Kernel" (with<br />
the space and without the quotes). It is quite common to forget to change<br />
the underscore "_" in Mach_Kernel to a space. Also, as usual with<br />
recent MkLinux updates, the Mach Kernel does not have a pretty icon.</p>
<p>Quick Guide to Files Available in the DR2.1update5 Directory:</p>
<p>Required for the update:</p>
<p> README<br />
contains this message</p>
<p> README.install<br />
How to install the Mach Kernel, Linux Server, Default Pager<br />
and MkLinux Booter</p>
<p> MkLinux_Booter.hqx<br />
The MkLinux Booter (a MacOS extension) binhexed</p>
<p> Mach_Kernel.gz<br />
vmlinux.gz<br />
default_pager.gz<br />
The Mach Kernel, Linux Server, and Default Pager in gzipped<br />
(ie. compressed) form</p>
<p>Optional sources and build tools:</p>
<p> README.build<br />
How to build the Mach Kernel and/or Linux Server<br />
(along with some other tasks in the Microkernel tree, such as<br />
the Default Pager)</p>
<p> DR2.1update5.osfmk.src.tgz<br />
Sources to Mach Kernel in gzipped tar format.<br />
(to extract: tar -zxpf DR2.1update5.osfmk.src.tgz)</p>
<p> DR2.1update5.osfmk.export.tgz<br />
The export/powermac directories, which contains the "exportable"<br />
pieces of the Microkernel build (include files and libraries)<br />
(to extract: tar -zxpf DR2.1update5.osfmk.export.tgz)</p>
<p> DR2.1update5.mklinux.src.tgz<br />
Sources to the Linux Server update in gzipped tar format.<br />
(to extract: tar -zxpf DR2.1update5.mklinux.src.tgz)</p>
<p> DR2.1update5.tools.tgz<br />
Various "Mach tools" that are needed to build both the microkernel<br />
and the Linux server.</p>
<p> ode-bin.tgz<br />
OSF development environment tools that are needed to build the<br />
microkernel.</p>
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