From 4011f9d956e224ed245d54dcfcf5d152a5ca297d Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Tue, 23 Sep 2008 23:36:55 +0100
Subject: [phantom] Skip command PEG initialisation if PEG is already running

It is possible for the BIOS to use the UNDI API to bring up the NIC
prior to system boot.  If this happens, UNM_NIC_REG_CMDPEG_STATE will
contain the value 0xf00f (UNM_NIC_REG_CMDPEG_STATE_INITIALIZE_ACK),
and we should skip initialising the command PEG.
---
 src/drivers/net/phantom/phantom.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/drivers/net/phantom/phantom.c b/src/drivers/net/phantom/phantom.c
index a1313dc3..6c7d1fc9 100644
--- a/src/drivers/net/phantom/phantom.c
+++ b/src/drivers/net/phantom/phantom.c
@@ -1673,6 +1673,17 @@ static int phantom_init_cmdpeg ( struct phantom_nic *phantom ) {
 	uint32_t cmdpeg_state;
 	uint32_t last_cmdpeg_state = 0;
 
+	/* Check for a previous initialisation.  This could have
+	 * happened if, for example, the BIOS used the UNDI API to
+	 * drive the NIC prior to a full PXE boot.
+	 */
+	cmdpeg_state = phantom_readl ( phantom, UNM_NIC_REG_CMDPEG_STATE );
+	if ( cmdpeg_state == UNM_NIC_REG_CMDPEG_STATE_INITIALIZE_ACK ) {
+		DBGC ( phantom, "Phantom %p command PEG already initialized\n",
+		       phantom );
+		return 0;
+	}
+
 	/* If this was a cold boot, check that the hardware came up ok */
 	cold_boot = phantom_readl ( phantom, UNM_CAM_RAM_COLD_BOOT );
 	if ( cold_boot == UNM_CAM_RAM_COLD_BOOT_MAGIC ) {
-- 
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