Just to clarify something in the article: On 20/05/14 20:38, Chris Samuel wrote:
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On Tue, 20 May 2014 07:52:52 PM Robert Brown wrote:
Proceeded to compile kernel and modules - without error. Followed steps in attached file. Fails to boot and because I have no access to u-boot prompt am unable to troubleshoot. Anyone have any comments on my compile process? I suspect that's related to the fact that the boards assume FEX support whereas the mainline kernel universe uses Device Tree instead.
The LWN article[1] I've just sent you off-list comments that:
# The solution was a runtime FEX-to-DT translator called sunxi-babelfish. # It behaves like a normal U-Boot kernel image, but instead reads the # FEX file and constructs a DT file that gets passed to the DT-based # kernel that is next in the boot progression. So mainline kernels can # now boot on most available boards and tablets. The A10 is presumably in this list so should at least boot on 3.15 rc5? and also from the article: "Most everything needed for a headless device is available" I am ok with it being headless but can any boot problems be diagnosed?
Why not support FEX? Well basically because it's a reinvention of Device Tree, but badly designed.
# Leighton showed why FEX was unsuitable for more than just a single # SoC—it was not possible to support a driver for new hardware in # Allwinner's FEX-only kernels.
But as the article goes on to point out the mainline support for these devices has a long way to go, so it looks for the near future you're really stuck with the old, hardware specific, kernels from the sunxi people. :-(
[1] - https://lwn.net/Articles/597916/ for other subscribers, free from Thursday when the next LWN comes out.
Best of luck, Chris - -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC
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