Looking at my system log (kernel 2.6.35.4), this is a common thing: Apr 24 12:04:49 kernel: radeon 0000:01:00.0: ffff8802d0aa1a00 reserve failed for wait Apr 24 12:04:49 kernel: radeon 0000:01:00.0: ffff8802d0aa1a00 reserve failed for wait Apr 24 12:04:51 kernel: radeon 0000:01:00.0: ffff8802d0aa1a00 reserve failed for wait Apr 24 12:04:51 kernel: radeon 0000:01:00.0: ffff8802d0aa1a00 reserve failed for [...]
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 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 Even though Xilinx supplies a cute wizard for creating peripherals in its EDK (version 13.2 in my case), it’s just enough to work as a demo. For a real-life case there’s no escape from getting down to the system’s guts. As it turns out, things are pretty well organized under EDK’s hood, which makes [...]
This is part III of my HOWTO on running Linux on Microblaze. The outline is as follows: Part I: Introduction and setting up the Microblaze processor Part II: Compiling the kernel Part III: Preparing for boot and booting (this page) Part IV: Compiling user space applications Generating the ACE file The ACE file is what [...]
This is part II of my HOWTO on running Linux on Microblaze. The outline is as follows: Part I: Introduction and setting up the Microblaze processor Part II: Compiling the kernel (this page) Part III: Preparing for boot and booting Part IV: Compiling user space applications Kernel compilation in general Compiling a Linux kernel traditionally [...]
This is part I of my HOWTO on running Linux on Microblaze. The outline is as follows: Part I: Introduction and setting up the Microblaze processor (this page) Part II: Compiling the kernel Part III: Preparing for boot and booting Part IV: Compiling user space applications Introduction This HOWTO goes through the procedures for getting [...]
Spoiler It’s very likely that you don’t need to read this. If all you want is to get a Linux kernel to detect a Microblaze processor on an Xilinx FPGA, the relevant information is in another post of mine. This post goes into the details which are necessary to understand, if you want to write [...]
