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Linux 2.6.27 Nearly There...

So, over the past few weeks I've been working on porting the linux kernel v 2.6.27.2 over to the bug. The driving force behind this was the addition of some much need instrumentation and debugging tools to the Kernel tree. We'd also prefer not to fall too far behind the current kernel release. Up to now we have been debugging almost exclusively with printk's which, depending on your point of view, might seem either arcane or old-school hardcore. Personally I'd prefer to have more than just a hammer in my box of tools.

At the low level I opted to remove gpiolib support to ease initial porting, but I'll probably see if I can throw this back in there because gpiolib is actually rather neat. After some effort modding the MX31 UART driver for console polling support, I managed to get kgdb working, although the driver is still a spot shaky in this area. After more effort, I have repaired a flaw in the the bitmapless dma pool allocation mechanism introduced in the 2.6.25 release. A code error in the freescale usb on-the-go host driver lead to the attempted double freeing of a dma pool allocation. This led to negative reference counts and other assorted nasty issues within the dma pool subsystem. This illustrated a pretty serious lack of robustness in an integral kernel component, and I'm hoping that our fix or a simillar solution gets merged. I should note that troubleshooting this with printks would've been excrutiating and that having kgdb was a serious life saver...

bug-linux-2.6.27.2 is in our svn tree and is 100% useable under almost all circumstances. I'm still working on some USB issues...The OTG host is up and running, but the EHCI driver for full USB functionality still has some problems. As such, the USB port on the Von Hippel is not yet useable. I'd encourage anyone thats curious to checkout, build, and run this kernel as I need more feedback on what works and what doesn't.

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Bug Labs team misaacs
misaacs
Hardware-Software interaction is my bag, and so I work here as an...
Member since: 10/31/08
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