Messages in this thread | | | Date | Tue, 24 Jul 2012 17:24:04 +0100 | From | Catalin Marinas <> | Subject | Re: [08/36] AArch64: Kernel booting and initialisation |
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On Mon, Jul 23, 2012 at 09:52:22PM +0100, Christopher Covington wrote: > Hi Catalin and Stephen, > > Catalin Marinas - July 8, 2012, 9:18 a.m. > > On Fri, Jul 06, 2012 at 10:32:54PM +0100, Stephen Warren wrote: > > > >> Also, on Tegra at least and perhaps OMAP too, there are a few parts > >> of earlyprintk serial port setup (i.e. port selection) which happen > >> as part of the decompressor rather than the main kernel image, so > >> we'd have to re-jig that too. > > > > Whatever we did on AArch32, if it was useful and we want to follow a > > similar model it needs porting given that the code cannot be shared. So > > there is nothing to re-jig but rather implement. > > > > As for earlyprintk, you can initialise it in the decompressed kernel > > anyway. But even though it's a useful debugging tool, it goes against > > the single Image aim (at least the current printascii/addruart > > implementation). I don't have a proper implementation yet. > > Would DCC [1] be a reasonably commonly available early printk mechanism > for the single image to provide?
Yes, this can be implemented but I think it has its own restrictions, requiring a JTAG connection.
-- Catalin
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