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[Qemu-devel] [PATCH 0/4] Fix the lazy CFI mode switch
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] [PATCH 0/4] Fix the lazy CFI mode switch |
Date: |
Thu, 13 May 2010 16:16:44 +0200 |
This series addresses the major problem lazy mode switching of the
pflash_cfi02 currently has: code execution from this ROM can fail.
The reason for this was a conceptual issue that was papered over by a
bug in the original implementation. Both are addressed here by
- allowing code execution from marked I/O memory regions (specifically
ROM devices)
- performing the lazy switch back of cfi02 from reprogramming to ROM
mode via a timer
To recall why this effort is needed: Programming 7 MB of an 8 MB flash
that does not support the unlock bypass command takes 5:40 minutes with
this optimization and about 3 h (estimated, it became boring to wait for
completion) without it.
Jan Kiszka (4):
cfi02: Fix a debug print
Add support for execution from ROMs in IO device mode
cfi: Mark flash memory executable
cfi02: Use timer-based ROM mode switch
cpu-common.h | 2 ++
exec-all.h | 2 +-
exec.c | 2 +-
hw/pflash_cfi01.c | 9 +++++----
hw/pflash_cfi02.c | 46 ++++++++++++++++++++++++++++++++++------------
5 files changed, 43 insertions(+), 18 deletions(-)