Not wanting to make this a linux debate
What I mean is: if the support sucks and the Peak support is expensive, at least you have a chance to fix OpenSource and Semi-Opensource stuff by yourself. It might be an option.
The problem I have is related to the lack of interest in help, and even the company who did those boards has recently replied to my emails telling me that the product is EOL, therefore there will be no support from them concerning the kernel driver for recent kernels. And tools in userspace are generally ... poor.
This means you need to put your effort here, developing stuff, updating stuff, porting stuff, etc, because with CAN bus nothing is ready out of the shelf, and this is probably the bad face of semi-OpenSource. You have a source, but there not much interest, and you are alone, but It's better than nothing when you are not willing to spend money on commercial products like Peak USBCAN.
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The other option is Coldfire v2 since they had something implemented by Motorola and Freescale.