Re: System has no response when calibration

Generally this is due to incorrect BIOS settings and kernel config issues. Some BIOSes are not compatible with RTAI, but sometimes configuring a kernel with "make tinyconfig" and tuning it to the max, specifically for your hardware, is a workaround. Another thing you can try doing is using a different kernel version patched with hal-linux. I.e. 3.14 or 31.18 vs 4.0, etc. Kernel panics and system freezes are quite common, I managed to fix every one I've encountered without changing hardware so far. Generally high-end AMD gaming desktop motherboards have a wide variety of settings in the BIOS/UEFI setup. ASUS and GIGABYTE give me the least amount of trouble. MSI tends to use the ACPI ATA controller and a bunch of other goofy stuff in hardware so I tend to avoid them for RTOS, HP is by far th
 e worst, hardly any options and highest latency (at least my luck with them.) If you stick with the right brands, and get the higher end gaming ones, there's plenty of things to tinker with in the s
 ettings to fix whatever problem you're having, so all the trouble I ever have is with the kernel itself.

As for DRM and graphics settings, you CAN still have those enabled and be able to debug but it requires some more work. What you need to do is compile the GPU firmware into the kernel, specifying file names of the firmware you wish to include, and not compile DRM as a module, but built-in. What kills debugging is all the DRM module loading and unloading and you can't see what the hell is going on. Serial debug itself won't be affected by DRM options because the kernel output has nothing to do with the display as it's controlled at a lower level in the kernel params but debugging off of only one computer does tend to become a lot more difficult. I always start off with a bunch of debugging options in the kernel hacking section enabled to make sure IPIPE is loading and unloading correctly fi
 rst, then start optimizing and disabling features from there.

Alec Ari
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