c++/cli can theoretically be used with WPF/Silverlight using the trick of replacing the C# generated from the XAML with a macro definition that can be used inside the main class in a code behind file. I worked out this technique but haven’t had the motivation to take it beyond theory – I’m quite happy mixing … Read more
This can happen if you accidentally #import a .m file instead of the .h!
It’s possible to install on regular arm64 brew python, you need to compile it yourself. If numpy is already installed (from wheels) you’ll need to uninstall it: pip3 uninstall -y numpy pythran I had to compile numpy, which requires cython and pybind11: pip3 install cython pybind11 Then numpy can be compiled: pip3 install –no-binary :all: … Read more
A difference between ARM and the x86 is PIO. There are no special instruction on the ARM to access an I/O device. Everything is done through memory mapped I/O. A second difference is the ARM (and RISC in general) has a separate load/store unit(s) that are separate from normal logic. A third difference is that … Read more
First, a paper you should consider reading, if you want to understand floating point foibles better: “What Every Computer Scientist Should Know About Floating Point Arithmetic,” http://www.validlab.com/goldberg/paper.pdf And now to some meat. The following code is bare bones, and attempts to produce an IEEE-754 single precision float from an unsigned int in the range 0 … Read more
Linux can do the fixup for you or warn about the access. You can enable the behavior in /proc/cpu/alignment, see http://www.mjmwired.net/kernel/Documentation/arm/mem_alignment for an explanation of the different values. 0 – Do nothing (default behavior) 1 – Warning in kernel-log with PC and Memory-Address printed. 2 – Fixup error 3 – Warn and Fixup 4 – … Read more
No, kernel memory is unswappable.
You have two choices, Get the right compiler. Write your own ‘C’ Library. Get the right compiler. You are always safest to have a compiler match your system. This applies to x86 Linux and various distributions. You are lucky if different compilers work. It is more difficult when you cross-compile as often the compiler will … Read more
It is worth noting that only external aborts can be configured to be taken in monitor mode, so MMU access faults will not be trapped. As for the main question: the state of all Secure/Non-secure banked registers while in monitor mode is controlled by the state of the cp15 Secure Configuration Register NS bit: when … Read more
We seem to have ported Das U-Boot successfully. There’s evidence that that is a faulty assumption. Just before calling the kernel, the pointer theKernel is 10008000 and not 10800000. Which version of U-Boot are you using? In both 2012.10 and 2013.04 versions of U-Boot, the variable theKernel is only declared and used by code for … Read more