Re: [Qemu-devel] [PATCH 0/2] port over extboot from kvm

[Gerd Hoffmann <kraxel@redhat.com>]

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   Hi,,

> Booting a rawhide install from a virtual usb stick doesn't actually work
> though, looks like it stresses qemus usb emulation too much.

Hmm, might be linux simply doesn't like the speed of usb 1.1 for mass 
storage.  With the attached debug patch rawhide boots up to the login 
prompt just fine.

cheers,
   Gerd

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>From 4c94383b57d66e7eedb11c4a07d579fb374bec6b Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 8 Sep 2009 13:53:15 +0200
Subject: [PATCH] make usb 1.1 go insane fast

---
 hw/usb-uhci.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/hw/usb-uhci.c b/hw/usb-uhci.c
index 09ffd4b..4a627ab 100644
--- a/hw/usb-uhci.c
+++ b/hw/usb-uhci.c
@@ -63,7 +63,7 @@
 #define UHCI_PORT_CSC   (1 << 1)
 #define UHCI_PORT_CCS   (1 << 0)
 
-#define FRAME_TIMER_FREQ 1000
+#define FRAME_TIMER_FREQ 100000
 
 #define FRAME_MAX_LOOPS  100
 
-- 
1.6.2.5