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misc:acpi_patch [2025/04/26 23:37] – rqmmisc:acpi_patch [2025/06/29 00:26] (current) – 92.40.32.213
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 After you reboot, the new kernel should be the one in use. It will be easy to tell whether the patch worked, because if your system boots "normally", it worked, if you are back at waiting for 2+ hours at "sd0", it failed and you need to check over whether you did everything correctly. After you reboot, the new kernel should be the one in use. It will be easy to tell whether the patch worked, because if your system boots "normally", it worked, if you are back at waiting for 2+ hours at "sd0", it failed and you need to check over whether you did everything correctly.
 +
  
 ---- ----
-=== II. The Custom Installer Way === 
  
-Creating a custom installer requires you to have another amd64 machine running OpenBSD. You will be able to build the kernel at the version your OpenBSD machine is already on. You need to make sure you are fetching the appropriate version of the sources, like above.  
  
-The procedure, in short, involves building the custom GENERIC.MP image as well as a custom RAMDISK, but WITHOUT running ''make install'' at the end. Then you create a ''vnode'' device out of the downloaded ''installXX.img'', mount it, then overwrite the installer's {bsd,bsd.mp,bsd.rd} files with the ones you created.+===== Updating the patched system ===== 
 +If you want to avoid having to wait 2+ hours again TWICE everytime you have to update your system, there is, fortunately, a much quicker way to do it. Basically the less painfully slow update method is a hybrid of manual and automatic installation with custom-compiling the kernel. Credits go to [[https://marc.info/?l=openbsd-tech&m=175031825008339&w=2|Stuart Henderson]] for pointing out this possibility.
  
-== 0. Preliminaries ==+The below will be a walkthrough that follows ''-current'', a few commands will be different for ''-stable'', these will be indicated.
  
-You will also need a copy of ''installXX.img'' and a flash drive. (Some Macs cannot boot off an SD card so best to stick with USB flash drives).+==== 0. Preparation ==== 
 +=== 0.a. READ UP. Seriously. === 
 +Read through the [[https://www.openbsd.org/faq/upgrade77.html#NoInstKern|OpenBSD Manual Installation howto in the FAQ]] first as well as the man pages linked above, if you have not done so. They will make your life much much easier.
  
-If you are on ''-current'' then you need to make sure that the installer you download corresponds to the snapshot you are on. To see what version exactly you are on, run:+=== 0.b. Preparation === 
 +Follow the "Preparation" steps on the Manual Upgrade page: especially on becoming root "properly" and installing the boot blocks. Make sure you install the boot blocks to the appropriate drive, do not just go with "sd0" as it was in the tutorial, if, say your root is on e.g. sd3. 
 + 
 +==== 1. Get the upgrade files ==== 
 +Fetch the updates and move them to a new location. When you run ''sysupgrade'' the installer files are stored in ''/home/_sysupgrade'', and two extra files are created, ''/bsd.update'' and ''/auto_upgrade.conf''. You want to copy the installer files from ''/home/_sysupgrade'' somewhere else, and delete the auto-update files.
 <code> <code>
-$ sysctl kern.version +# sysupgrade -ns 
-kern.version=OpenBSD 7.7-current (GENERIC.MP) #0: Wed Apr 23 20:21:10 BST 2025 +# mkdir /usr/update 
-    [..snip..]+# mv /home/_sysupgrade/* /usr/update/ 
 +# rm /{bsd.update,auto_upgrade.conf}
 </code> </code>
 +**NB**: On ''-stable'' you want to run ''sysupgrade -n''.
  
-Note the date; in the above example, it's **"Apr 23 2025"**, so you need the installXX.img from that same snapshot - as it's on **7.7-current** it will be ''install77.img''.+==== 2. Update the source tree ==== 
 +Follow the **Anonymous CVS** guides for updating the source tree to the latest version.  
 +☛ **ASIDE** - What to do if acpi.c changes drastically and the patch doesn't work anymore? ((The file we have been patching, ''/usr/src/sys/dev/acpi/acpi.c'', might change in the future. It is good to check the CVS logs, or keep an eye on the [[https://github.com/openbsd/src/commits/master/sys/dev/acpi/acpi.c|acpi.c on GitHub's CVS mirror]].  If you would see that the lines we have been working with have changed in the source or new features have been introduced, then you need to revert your local modifications to the CVS version. To do this, you need to run, 
 +<code> 
 +$ cd /usr/src/sys/dev/acpi/ 
 +$ cvs update -C acpi.c 
 +</code> 
 +CVS will tell you where it stashed the previous file, it usually starts with ".#" or similar. You can then run ''diff'' and see what the changes were, decide whether you need to find the lines that were previously around :823 and automatically or manually patch again, or not.))
  
-A good place to get previous snapshots is on ''ftp://ftp.hostserver.de/archive/'', choosing the ''YYYY-MM-DD-HHSS'' format directory that corresponds to the date of your ''kern.version'' date; so in this example, the file needed would be at:+To update the source tree on ''-current'', run: 
 +<code> 
 +$ cd /usr/src 
 +$ cvs -q up -Pd -A 
 +</code> 
 +**NB**: On ''-stable'' you want to use '' -rOPENBSD_7_7'' as the last parameter instead of "-A".  
 + 
 +==== 3. Re-compile the GENERIC.MP Kernel ==== 
 +See above, but run ''# make clean'' before compiling and **do not** run ''# make install'' at the end: 
 +<code> 
 +# cd /sys/arch/amd64/compile/GENERIC.MP/ 
 +# make clean 
 +# make obj 
 +# make config 
 +# make 
 +</code> 
 +Your newly compiled kernel file, ''bsd.gdb'' will be in the symlinked ''obj'' directory. The symlink points to ''/usr/obj/sys/arch/amd64/compile/GENERIC.MP/bsd.gdb''. 
 + 
 +Now we have: 
 +  * The latest update files stored away safely  
 +  * The latest kernel, compiled with our own patch 
 + 
 +So it is time to move on to the installation. 
 + 
 +==== 4. Manual installation ==== 
 +This follows closely the official [[https://www.openbsd.org/faq/upgrade77.html#NoInstKern|manual installation guide]], but diverges for the installation of the kernel. 
 + 
 +=== 4.a. Make sure you have done all the preparation in the official guide === 
 +Did you? 
 + 
 +=== 4.b Install the newly compiled kernel === 
 +We did not run ''make install'' after compiling because we are going to do this little dance as suggested: 
 +<code> 
 +# cd /usr/update 
 +# ln -f /bsd /obsd  
 +# cp /usr/obj/sys/arch/amd64/compile/GENERIC.MP/bsd.gdb /nbsd && mv /nbsd /bsd 
 +# cp bsd.rd / 
 +# cp bsd /bsd.sp # You might not even have this file, relatively safe to skip this last one if you do not intend to run in single-processor mode 
 +</code>
  
-''%%https://ftp.hostserver.de/archive/%%**2025-04-23-0105**/snapshots/amd64/**install77.img**''+=== 4.c follow the rest of the Manual Install Process === 
 +Follow closely the linked manual installation guide, and continue the process: Enable KARL; Install new userland. Reboot. Run MAKEDEV,  update the boot loader, run ''sysmerge'' and ''fw_update''.
  
 +DONE!