I really have this thing about backward compatibility, which is why I chose to enable the CONFIG_SYSFS_DEPRECATED and CONFIG_SYSFS_DEPRECATED_V2 kernel flags when compiling kernel 3.12 for Fedora 12. After all, an old distribution with a new kernel. This turned out to be wrong: The distribution isn’t all that old, and automounting stopped to work for [...]
For a reason not so clear to me, VMware doesn’t keep its drivers up to date with newer kernels, so they fail to compile against newer kernels. Consequently, there’s an insane race to patch them up. It starts with a compilation failure at the GUI level, and sooner or later it becomes clear that there’s [...]
So there’s this “+” sign added to the kernel version (as displayed with uname -r) when the kernel is compiled with a git tree that doesn’t sit on an official version (or more precisely, not on an annotated tag). Which kinda makes sense to tell the kernel’s users that the kernel isn’t exactly the vanilla [...]
Unlike how I usually treat software tools I work with, my attitude towards U-boot is “if it works, never mind how and why”. Trying to understand the gory details of U-boot has never been very rewarding. Things work or break more or less randomly, depending on which git revision is checked out. Someone sent a [...]
Since the device tree is the new way to set up hardware devices on embedded platforms, I hoped that I could avoid the “platform” API for picking which driver is going to take control over what. But it looks like the /arch/arm disaster is here to stay for a while, so I need to at [...]
This is my short saga about my not necessarily intelligent actions for reading a DocBook paper. So I wanted to read some documentation from my Linux kernel sources. It happened to be in DocBook format. In the kernel source’s root, I tried $ make htmldocs or I could have gone $ make pdfdocs Or mandocs. [...]
What this blob is all about Running some home-cooked SDMA scripts on Freescale’s Linux 2.6.28 kernel on an i.MX25 processor, I’m puzzled by the fact, that cache flushing with dma_map_single(…, DMA_TO_DEVICE) doesn’t hurt, but nothing happens if the calls are removed. On the other hand, attempting to remove cache invalidation calls, as in dma_map_single(…, DMA_FROM_DEVICE) [...]
The problem In short: Running linux 3.8.0 on Altera’s Cyclone V SoC, NetworkManager doesn’t bring up the Ethernet port. It also makes false accusations such as Jan 1 00:00:17 localhost NetworkManager[1206]: <info> (eth0): driver ‘stmmaceth’ does not support carrier detection. and later on also says Jan 1 00:00:17 localhost NetworkManager[1206]: <warn> (eth0): couldn’t get carrier [...]
Trying to insmod a kernel module, which was just compiled against the true headers of the running kernel, I got: # insmod mymodule.ko insmod: error inserting ‘mymodule.ko’: -1 Invalid module format And this in /var/log/syslog: mymodule: version magic ’3.3.0-xxx SMP preempt mod_unload ARMv7 ‘ should be ’3.3.0-xxx+ SMP preempt mod_unload ARMv7 ‘ Really? Are you [...]
Having some trouble to figure out what I should write in my own hand-written DTS entry for my logic, I ended up reading the sources of the Linux kernel (version 3.3, which is the currently used for Zynq). The purpose is to hook up a device defined in the PL of a Zynq-7000 (FPGA-style logic [...]
