Messages in this thread | | | Date | Mon, 26 Feb 2018 11:49:55 +0300 | From | Cyrill Gorcunov <> | Subject | Re: [tip:x86/boot] x86/boot/compressed/64: Prepare trampoline memory |
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On Mon, Feb 26, 2018 at 11:37:09AM +0300, Kirill A. Shutemov wrote: > On Mon, Feb 26, 2018 at 11:15:34AM +0300, Cyrill Gorcunov wrote: > > On Mon, Feb 26, 2018 at 11:02:56AM +0300, Kirill A. Shutemov wrote: > > ... > > > > Also, could do a puts() hexdump of the affected memory area _before_ we overwrite > > > > it? Is it empty? Could we add some debug warning that checks that it's all zeroes? > > > > > > The problem is that we don't really have a way get a message out of there. > > > > > > http://lkml.kernel.org/r/793b9c55-e85b-97b5-c857-dd8edcda4081@zytor.com > > > > > > > I'm sorry for stepping in (since I didn't follow the series in details) > > but can't we use vga memory here and print this early data tere? > > I have no idea how to do this :/
https://wiki.osdev.org/Printing_To_Screen
Kirill, note that it might not do the trick at all, just give the link a shot and check if it would worth the efforts.
> > And what about systems without monitor at all?
Such early boot things *require* additional equipment anyway jtag/monitors/etc for debug stage at least.
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