linux-kernel - Re: [PATCH v1 00/12] PCI: Rework shadow ROM handling

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Message-ID: <CA+55aFwhMWDa4=7x_AgH34Z2US+gyuHT_-=S+vwkZAbkHRm10Q@mail.gmail.com>
Date:	Fri, 11 Mar 2016 17:09:10 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Bjorn Helgaas <helgaas@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Tony Luck <tony.luck@...el.com>,
	DRI <dri-devel@...ts.freedesktop.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Bruno Prémont <bonbons@...ux-vserver.org>,
	Daniel Stone <daniel@...ishbar.org>,
	Alex Deucher <alexdeucher@...il.com>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Subject: Re: [PATCH v1 00/12] PCI: Rework shadow ROM handling

On Fri, Mar 11, 2016 at 4:49 PM, Andy Lutomirski <luto@...capital.net> wrote:
>
> FWIW, if I disable all the checks in pci_get_rom_size, I learn that my
> video ROM consists entirely of 0xff bytes.  Maybe there just isn't a
> ROM shadow on my laptop.

I think most laptops end up having the graphics ROM be part of the
regular system flash, and there is no actual rom associated with the
PCI device that is the GPU itself.

The actual GPU ROM tends to be associated with plug-in cards, not
soldered-down chips in a laptop where they don't want extra flash
chips.

               Linus