netdev - Re: r8169 chips on some Intel D945GSEJT boards fail to work after PXE boot

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Date:	Wed, 23 Sep 2009 22:57:23 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Simon Farnsworth <simon.farnsworth@...lan.com>
Cc:	netdev@...r.kernel.org
Subject: Re: r8169 chips on some Intel D945GSEJT boards fail to work after
	PXE boot

Simon Farnsworth <simon.farnsworth@...lan.com> :
[...]
> Some boards are good, and just work, whether I boot via PXE or boot from
> the local disk; dmesg.working and lspci.working are from a good board.
> 
> Some boards are bad; they work fine if I boot from local disk (including
> network), but the kernel cannot detect link, or send or receive data if
> I PXE boot. dmesg.broken and lspci.broken are from a bad board.

No cunning theroy in sight but does reducing the amount of memory on a
bad board from 1 Go to 512 Mo turn it into a good one ?

The failing board exhibits a correctable error status bit. Clearing it
is the least we can do.

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 50c6a3c..79bc4ab 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -2200,6 +2200,11 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	tp->pcie_cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
 	if (!tp->pcie_cap && netif_msg_probe(tp))
 		dev_info(&pdev->dev, "no PCI Express capability\n");
+	else {
+		pci_write_config_word(pdev, tp->pcie_cap + PCI_EXP_DEVSTA,
+				      PCI_EXP_DEVSTA_CED | PCI_EXP_DEVSTA_NFED |
+				      PCI_EXP_DEVSTA_FED | PCI_EXP_DEVSTA_URD);
+	}
 
 	RTL_W16(IntrMask, 0x0000);
 
-- 
Ueimor
--
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