From: Matt Fleming <matt.fleming@intel.com>
To: Shea Levy <shea@shealevy.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org
Subject: Re: EFI Boot Stub Early Console
Date: Mon, 19 Mar 2012 08:47:14 +0000 [thread overview]
Message-ID: <1332146834.4041.46.camel@mfleming-mobl1.ger.corp.intel.com> (raw)
In-Reply-To: <4F65D09B.4050807@shealevy.com>
On Sun, 2012-03-18 at 08:10 -0400, Shea Levy wrote:
> Hi Matt,
>
> On 3/18/12 7:21 AM, Matt Fleming wrote:
> > I don't think you'll need to use the graphics protocols, you should
> > just be able to put something together using the 'output_string'
> > function from the EFI simple text output protocol, e.g. something like
> > this, https://lkml.org/lkml/2012/3/16/193
>
> From the UEFI 2.3.1 spec:
>
> > Prior to a call to ExitBootServices(), all of the fields of the EFI
> > System Table are valid. After an operating system has taken control of
> > the platform with a call to ExitBootServices(), only the Hdr,
> > FirmwareVendor, FirmwareRevision, RuntimeServices,
> > NumberOfTableEntries, and ConfigurationTable fields are valid.
>
> Doesn't this mean that ConOut can't be used for the earlyprintk, since
> any bootloader (including the bootstub) will call ExitBootServices()
> before any printk'ing actually happens?? Or am I misunderstanding the
> spec somehow? I suppose I could just try it and see what happens...
Oops. Good point, that isn't going to work.
next prev parent reply other threads:[~2012-03-19 8:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-12 18:56 Shea Levy
2012-03-12 19:00 ` Shea Levy
2012-03-12 22:11 ` H. Peter Anvin
2012-03-12 22:18 ` Shea Levy
2012-03-12 22:23 ` H. Peter Anvin
2012-03-12 22:28 ` Shea Levy
2012-03-17 13:12 ` Shea Levy
2012-03-18 11:21 ` Matt Fleming
2012-03-18 12:10 ` Shea Levy
2012-03-19 8:47 ` Matt Fleming [this message]
2012-03-19 15:56 ` Alan Cox
2012-03-19 16:02 ` Shea Levy
2012-03-19 16:03 ` Matt Fleming
2012-03-20 15:45 ` Maarten Lankhorst
2012-03-20 16:43 ` H. Peter Anvin
[not found] ` <CAOhV88Om7hKHeaGNp-PtFkn=y0T9EBQCbPSBE58vOYQ2+Genew@mail.gmail.com>
2012-03-18 4:29 ` Shea Levy
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