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    SubjectRe: EFI Boot Stub Early Console
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    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.



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