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Re: [Qemu-devel] [PATCH] pcnet: make subsystem vendor id match hardware
From: |
Stefan Weil |
Subject: |
Re: [Qemu-devel] [PATCH] pcnet: make subsystem vendor id match hardware |
Date: |
Tue, 16 Mar 2010 22:29:43 +0100 |
User-agent: |
Mozilla-Thunderbird 2.0.0.22 (X11/20090707) |
Michael S. Tsirkin schrieb:
> Real pcnet device (AT2450) apparently has subsystem
> device and vendor id set to 0, this is out of spec
> (which requires that vendor id is obtained from PCI SIG)
> but windows xp driver seems to need this in order
> to associate.
>
> qemu sets pci subsystem id to qumranet/qemu
> since d350d97d196a632b6c7493acf07a061017fc6f7d,
> debian does not yet have this patch.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=521247
>
> Signed-off-by: Michael S. Tsirkin <address@hidden>
> Cc: Gerd Hoffmann <address@hidden>
> Cc: Anthony Liguori <address@hidden>
> ---
> hw/pcnet.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/hw/pcnet.c b/hw/pcnet.c
> index 44b5b31..12260be 100644
> --- a/hw/pcnet.c
> +++ b/hw/pcnet.c
> @@ -1997,6 +1997,9 @@ static int pci_pcnet_init(PCIDevice *pci_dev)
> pci_set_long(pci_conf + PCI_BASE_ADDRESS_0 + 4,
> PCI_BASE_ADDRESS_SPACE_MEMORY);
>
> + pci_set_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID, 0x0);
> + pci_set_word(pci_conf + PCI_SUBSYSTEM_ID, 0x0);
> +
> /* TODO: value must be 0 at RST# */
> pci_conf[PCI_INTERRUPT_PIN] = 1; // interrupt pin 0
> pci_conf[PCI_MIN_GNT] = 0x06;
>
Don't you think that a comment in the code
(with the same explanation which you wrote above)
would be helpful in this special case?
Of course one can always call git blame, but
a comment is easier to read.
Regards
Stefan