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- October 21, 1997
-
- Announcing the fifth update to MkLinux DR2.1.
-
- The "DR2.1update5" update fixes several bugs in MkLinux's Microkernel
- and Server. Some performance enhancements and new features are included
- as well.
-
- The update is available for anonymous ftp from ftp.mklinux.apple.com:
-
- ftp://ftp.mklinux.apple.com/pub/Updates/DR2.1update5/
-
- or our various mirror sites, in the directory:
-
- .../Updates/DR2.1update5/
-
- (Please be patient with the mirror sites, it may take them some time to
- mirror the update)
-
- *** IMPORTANT NOTES ****
-
- General
- -------
-
- This update consists of a new Microkernel, Linux Server, Default Pager,
- and MkLinux Booter. Unlike updates 3 and 4, there are no new RPM (Redhat
- Package Manager) packages to download and install. There have been newer
- versions of some of the shared library based RPMs made available since
- update 4, as well as many shared library based RPMs that weren't part of
- updates 3 and 4. However, they are not part of this update. You may
- obtain them separately from ftp.linuxppc.org and its mirrors.
-
- The sources to the Microkernel, Default Pager, and Linux Server, as well
- as the tools and instructions needed to build them, are included for those
- of you interested. However, there is no requirement to rebuild these
- components in order to apply the update.
-
-
- Upgrade Path
- ------------
-
- This is an update to MkLinux DR2.1. If you are still running MkLinux DR1,
- DR2, or DR2 with updates, then you should upgrade to DR2.1 before applying
- this update.
-
- It is easiest if you apply this update to a system that has already been
- updated to the previous level, DR2.1update4. However, it is possible
- to skip updates if you follow the instructions in the file README.install.
-
- Here's a summary:
-
- From: To: Valid:
- ----- --- ------
- DR2.1update4 -> DR2.1update5 (YES)
- DR2.1update3 -> DR2.1update5 (YES) *
- DR2.1update2 -> DR2.1update5 (YES) *
- DR2.1update1 -> DR2.1update5 (YES) *
- DR2.1 -> DR2.1update5 (YES) *
- DR2 -> DR2.1update5 (NO)
- DR1 -> DR2.1update5 (NO)
-
- * Note: When updating a DR2.1, DR2.1update1, DR2.1update2, or DR2.1update3
- system to this update (DR2.1update5), you will need to apply the pieces
- from this update (the kernel, server, default pager, and booter) and then
- bring the shared libraries on your system up to the "DR2.1update4" level.
- See the file README.install for more information.
-
-
- Bug Fixes
- ---------
- We believe this update fixes the following bugs.
-
- - All the memory in large memory machines can now be used. In previous
- updates, people with more than about 90 Mb of ram had to limit their
- memory by using the "-m" mach option. The "-m" option still works.
- However, you should now remove the "-m" option if you used it in the
- past. NOTE: take care to keep the Linux server from using more memory
- than it can handle, see the Enhancements section below.
-
- - The saved MacOS timezone is now used by the microkernel to determine
- its own time, which is in GMT. The Linux server's time is then derived
- from the microkernel's time.
-
- - On PCI machines, the bus speed is properly detected. The previous
- workaround, mach option "bus_speed_hz", no longer does anything.
-
- - On PCI machines, the video card (ATI or IMS Twin Turbo) is properly
- detected. The previous workaround, mach option "video_probe",
- no longer does anything.
-
- - There are fixes in signal handling that were causing problems with
- the JDK (Java Development Kit).
-
-
- Enhancements
- ------------
-
- - New MkLinux Booter
- - Ability to boot with MacOS's VM on
- - Passes open firmware device tree to Microkernel
- - Can default boot into MkLinux or MacOS
- - NOTE: This Booter will not work with any Mach Kernel
- prior to the one in DR2.1update5.
-
- - The IMS Twin Turbo video card now works properly.
-
- - Audio now works on PCI based Macs.
- - You'll notice that there is now an audible "beep" on these machines.
- - Audio recording isn't available yet.
- - Audio support for the NuBus Macs (6100/7100/8100] is not in this
- update. We expect to have it working on these machines soon.
- - There is a nice utility called wavplay that will play ".wav" files.
- You can retrieve it from ftp://ftp.linuxppc.org/linuxppc/redhat/RPMS/ppc/
-
- - Improved disk I/O performance. Swapping/Paging performance has
- been improved as well.
-
- - Real SPL's have been implemented on the PCI Powermacs. This helps
- balance the I/O load placed on a system. It is also more of the
- groundwork being put in place for future SMP capability.
-
- - Additions to the /proc filesystem. In /proc/osfmach3/ there are some
- more entries describing what's going on inside Mach. /proc/scsi/scsi
- is now present and contains useful information.
-
- - Now uses the same kernel loadable modules as Linux/PPC.
-
- - A second segment register was added to the collocated server space. This
- means that the Linux server can map up to 512M when collocated.
- NOTE: for systems with more than 160M of RAM, you should change a line
- in your /mach_servers/bootstrap.conf file so that the Linux server
- doesn't grow bigger than it thinks it can handle. The line you will
- want to have is:
- -k -S 524288000 startup /dev/boot_device/mach_servers/vmlinux
- Make this change _before_ you remove the "-m" option from your lilo.conf,
- if you had used -m in the past.
-
- - HFS filesystem support built in to Linux server and bootstrap task.
-
- - The standard Linux little-endian ext2 support is built into the Linux
- server and bootstrap task. (Naturally, big-endian "ext2" is still
- available in this update.)
-
-
- Known Problems
- --------------
-
- - When booting with MacOS's VM turned on, some machines exhibit a
- noticible delay between the "System Booting..." message, and the
- first screen clear by the Microkernel. You may need to wait a few
- seconds.
-
- - This isn't really a problem, but most likely some people will
- run into this. You _must_ update the "MkLinux Booter" as well
- as the "Mach Kernel" in your Extensions folder. Any previous
- Booter will not work with the new Mach Kernel provided in this
- update. And vice-versa, any previous Mach Kernel will not work
- with the MkLinux Booter provided in this update.
-
- - Another "this isn't really a problem" about the "MkLinux Booter"
- "Mach Kernel". These two files have very specific names and things will
- _not_ work properly if they don't have the correct names. The new booter
- _must_ have the name "MkLinux Booter" (with the space and without the
- quotes). The new microkernel _must_ have the name "Mach Kernel" (with
- the space and without the quotes). It is quite common to forget to change
- the underscore "_" in Mach_Kernel to a space. Also, as usual with
- recent MkLinux updates, the Mach Kernel does not have a pretty icon.
-
-
- Quick Guide to Files Available in the DR2.1update5 Directory:
- -------------------------------------------------------------
-
- Required for the update:
-
- README
- contains this message
-
- README.install
- How to install the Mach Kernel, Linux Server, Default Pager
- and MkLinux Booter
-
- MkLinux_Booter.hqx
- The MkLinux Booter (a MacOS extension) binhexed
-
- Mach_Kernel.gz
- vmlinux.gz
- default_pager.gz
- The Mach Kernel, Linux Server, and Default Pager in gzipped
- (ie. compressed) form
-
-
- Optional sources and build tools:
-
- README.build
- How to build the Mach Kernel and/or Linux Server
- (along with some other tasks in the Microkernel tree, such as
- the Default Pager)
-
- DR2.1update5.osfmk.src.tgz
- Sources to Mach Kernel in gzipped tar format.
- (to extract: tar -zxpf DR2.1update5.osfmk.src.tgz)
-
- DR2.1update5.osfmk.export.tgz
- The export/powermac directories, which contains the "exportable"
- pieces of the Microkernel build (include files and libraries)
- (to extract: tar -zxpf DR2.1update5.osfmk.export.tgz)
-
- DR2.1update5.mklinux.src.tgz
- Sources to the Linux Server update in gzipped tar format.
- (to extract: tar -zxpf DR2.1update5.mklinux.src.tgz)
-
- DR2.1update5.tools.tgz
- Various "Mach tools" that are needed to build both the microkernel
- and the Linux server.
-
- ode-bin.tgz
- OSF development environment tools that are needed to build the
- microkernel.
-