It may help investigating the interrupt descriptors. For a 2.6.38 kernel, putting this in a kernel module load supplies some information (includes, declarations and code mixed below. Organize properly in your own module) #include <linux/irq.h> #include <linux/interrupt.h> #include <asm/irq.h> int i; struct irq_desc *desc; for_each_irq_desc(i, desc) { if (!desc) continue; printk(KERN_INFO “%d: status=%08x, chip=%08x, handle_irq=%08x\n”, [...]
What we have here As one can guess from my notes about the i.MX51′s external bus and the oscilloscope shots I’ve published, I made myself a small dissection kit for watching the bus’ lines activity with a digital oscilloscope. This is a good time to mention, that the kit was done quickly and dirty, so [...]
These are a few oscilloscope samples, some of which are pretty crude, showing Freescale’s i.MX51 accessing its address/data bus. I worked with an Armadeus APF51 board, which has a 16-bit multiplexed bus connected to the Xilinx Spartan-6 FPGA. The FPGA was used to wire bus signals to a pin header, so 1-2 ns skews between [...]
These are my notes as I made my way in grasping how the EIM bus works. Unfortunately, the information in the reference manual was far from complete, so except for the list of acronyms, this page consists of things I found out by reverse engineering the bus. The actual bus cycle outlines and timings are [...]
Scope This post was spun off the main post regarding setting up the Armadeus board for Embedded Linux on ARM and Xilinx Spartan-6 FPGA. It covers my own little war story as I set up the Buildroot SDK, so I could have my own cross compiler and Linux kernel to work with. As kernel.org happened [...]
Scope I got myself an Armadeus APF51 board for some work combining a fullblown ARM processor running embedded Linux with a recent Xilinx FPGA. I wrote down some setup notes for possibly future need while setting it up for work, and they are below. There is not really something undocumented here, but it’s more convenient [...]
