Attachment 137989 Details for Bug 75985 – Patch to simulate hidden HDA on systems which normally expose it

[patch] Patch to simulate hidden HDA on systems which normally expose it

0001-x86-efi-Hide-Nvidia-HDA-controller.patch (text/plain), 1.31 KB, created by Lukas Wunner on 2018-03-11 12:53:50 UTC

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Creator: Lukas Wunner

Created: 2018-03-11 12:53:50 UTC

Size: 1.31 KB

patch

obsolete

>From c3756ade6f83c42f36640a8fdf1dd118d2e4ab30 Mon Sep 17 00:00:00 2001
>From: Lukas Wunner <lukas@wunner.de>
>Date: Sun, 11 Mar 2018 10:20:51 +0100
>Subject: [PATCH] x86/efi: Hide Nvidia HDA controller
>
>This happens to work because the Nvidia GPU is the only PCI device on
>my machine with a ROM.  It's hackish because only the 64-bit code path
>is changed and it doesn't read-modify-write register 0x488, but instead
>blindly writes 0.
>
>Signed-off-by: Lukas Wunner <lukas@wunner.de>
>---
> arch/x86/boot/compressed/eboot.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
>diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
>index e56dbc67e837..67ac29743243 100644
>--- a/arch/x86/boot/compressed/eboot.c
>+++ b/arch/x86/boot/compressed/eboot.c
>@@ -223,6 +223,7 @@ __setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
> 	efi_status_t status;
> 	unsigned long size;
> 	uint64_t attributes;
>+	u32 buf = 0;
> 
> 	status = efi_early->call(pci->attributes, pci,
> 				 EfiPciIoAttributeOperationGet, 0,
>@@ -270,6 +271,10 @@ __setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
> 		goto free_struct;
> 
> 	memcpy(rom->romdata, pci->romimage, pci->romsize);
>+
>+	status = efi_early->call(pci->pci.write, pci, EfiPciIoWidthUint32,
>+				 0x488, 1, &buf);
>+
> 	return status;
> 
> free_struct:
>-- 
>2.16.2
>

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Attachments on bug 75985: 95562 | 128640 | 136369 | 136416 | 136418 | 137764 | 137939 | 137940 | 137941 | 137989 | 144596 | 145614 | 145615 | 145616 | 145627 | 145640 | 145778 | 145830

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