From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH] Fix efifb initialisation when the only GOP device implements ConOut. Date: Mon, 07 Jan 2013 19:45:46 +0000 Message-ID: <1357587946.2844.28.camel@shinybook.infradead.org> References: <1357431222.9270.73.camel@shinybook.infradead.org> <1357524250.9270.86.camel@shinybook.infradead.org> <1357578923.8203.72.camel@mfleming-mobl1.ger.corp.intel.com> <1357581080.2844.17.camel@shinybook.infradead.org> <20130107175846.GA385@srcf.ucam.org> <1357583795.2844.18.camel@shinybook.infradead.org> <20130107184320.GA1400@srcf.ucam.org> <1357585971.2844.22.camel@shinybook.infradead.org> <20130107191648.GA2229@srcf.ucam.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-kKEjQ3tF8ZFWEIwc6d1B" Return-path: In-Reply-To: <20130107191648.GA2229-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Matthew Garrett Cc: Matt Fleming , x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, "H. Peter Anvin" , linux-efi List-Id: linux-efi@vger.kernel.org --=-kKEjQ3tF8ZFWEIwc6d1B Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2013-01-07 at 19:16 +0000, Matthew Garrett wrote: > On Mon, Jan 07, 2013 at 07:12:51PM +0000, David Woodhouse wrote: > > 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 argum= ent=20 > > > for having it fail in that case, but it wouldn't even be able to prin= t=20 > > > an error message without some gymnastics. > >=20 > > Printing an error message is simple enough from assembler; you just nee= d > > to call sys_table->con_out->output_string. >=20 > I don't think that's guaranteed to do something unless we've set a=20 > console mode first, but sure, that ought to be an improvement. It's what we do for efi_printk() in all other cases where the EFI stub bails out. It's certainly fair enough as a best-effort. > > "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." >=20 > "(32|64) bit kernels cannot be booted via the EFI handover=20 > protocol on (64|32) bit firmware"? Yeah. But the bootloader *could* have booted this kernel, if it had just chosen to use the old handover protocol. And right now, there's no way for the bootloader to *tell* what it should do. It wouldn't be impossible to simply have both 32-bit and 64-bit stubs (conditionally) present in the kernel, and support both simultaneously. But if we can't do that, then I suspect we should at *least* make sure we let the bootloader know which one *is* available, so it doesn't end up calling the wrong one. Perhaps we should declare that handover_offset is for the 64-bit stub, and add a handover_offset32 for the 32-bit stub? --=20 dwmw2 --=-kKEjQ3tF8ZFWEIwc6d1B Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUbjCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK 75xCGhR8ToREoqe7zM9/UnC6TS2y9UKTpT1v7RSMzR0t6ndl0TWBuUr/UXBhPk+Kmy7bI4yW4urC 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