On 19 April 2013 18:14, Catalin Marinas catalin.marinas@arm.com wrote:
On Fri, Apr 19, 2013 at 05:33:18PM +0100, Peter Maydell wrote:
The command line lives in the DTB anyway so if you can't look in the DTB you can't get at earlyprintk config either way.
Linux indeed looks in the DT for the command line and that's what's triggering the earlyprintk console but at that stage the DT is flat. Unflattening the DT happens later (it requires slab allocator). I initially thought about extracting the early console device from the DT but when it is flat you can't parse the full hierarchy to get its address.
So you could add a DT property that specifies the information in a format that you can get at at the right time. That's annoying duplication, but at least it's not in the command line (which is a raw ascii string that QEMU &co shouldn't have to be parsing or editing). "/console/type" and "/console/address" or something?
-- PMM