From: David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
Cc: Matt Fleming
<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
linux-efi <linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] Fix efifb initialisation when the only GOP device implements ConOut.
Date: Mon, 07 Jan 2013 19:12:51 +0000 [thread overview]
Message-ID: <1357585971.2844.22.camel@shinybook.infradead.org> (raw)
In-Reply-To: <20130107184320.GA1400-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
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On Mon, 2013-01-07 at 18:43 +0000, Matthew Garrett wrote:
> The kernel does, the EFI boot stub doesn't. There's probably an argument
> for having it fail in that case, but it wouldn't even be able to print
> an error message without some gymnastics.
Printing an error message is simple enough from assembler; you just need
to call sys_table->con_out->output_string.
What should it say?
"Sorry, this kernel cannot boot in " (32|64) "-bit mode this way. Your
bootloader should have ignored the shiny new EFI handover protocol and
booted it the old way. It would have worked then, albeit without EFI
runtime services. Which you probably wouldn't have missed."
--
dwmw2
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next prev parent reply other threads:[~2013-01-07 19:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1357431222.9270.73.camel@shinybook.infradead.org>
[not found] ` <1357431222.9270.73.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2013-01-07 17:08 ` [PATCH] Fix efifb initialisation when the only GOP device implements ConOut Matt Fleming
[not found] ` <1357524250.9270.86.camel@shinybook.infradead.org>
[not found] ` <1357524250.9270.86.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2013-01-07 17:15 ` Matt Fleming
[not found] ` <1357578923.8203.72.camel-ZqTwcBeJ+wsBof6jY8KHXm7IUlhRatedral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-01-07 17:51 ` David Woodhouse
[not found] ` <1357581080.2844.17.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2013-01-07 17:58 ` Matthew Garrett
[not found] ` <20130107175846.GA385-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-01-07 18:36 ` David Woodhouse
[not found] ` <1357583795.2844.18.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2013-01-07 18:43 ` Matthew Garrett
[not found] ` <20130107184320.GA1400-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-01-07 19:12 ` David Woodhouse [this message]
[not found] ` <1357585971.2844.22.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2013-01-07 19:16 ` Matthew Garrett
[not found] ` <20130107191648.GA2229-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-01-07 19:45 ` David Woodhouse
[not found] ` <1357524456.9270.90.camel@shinybook.infradead.org>
[not found] ` <1357524456.9270.90.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2013-01-07 18:58 ` [PATCH] Specify ELF ABI for EFI handover protocol Matt Fleming
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