motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-04 00:03:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

hw/arm/aspeed: add a 'execute-in-place' property to boot directly from CE0

Browse source 
The overhead for the OpenBMC firmware images using the a custom U-Boot
is around 2 seconds, which is fine, but with a U-Boot from mainline,
it takes an extra 50 seconds or so to reach Linux. A quick survey on
the number of reads performed on the flash memory region gives the
following figures :

  OpenBMC U-Boot      922478 (~ 3.5 MBytes)
  Mainline U-Boot   20569977 (~ 80  MBytes)

QEMU must be trashing the TCG TBs and reloading text very often. Some
addresses are read more than 250.000 times. Until we find a solution
to improve boot time, execution from MMIO is not activated by default.

Setting this option also breaks migration compatibility.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200114103433.30534-5-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Cédric Le Goater 2020-01-30 16:02:02 +00:00 • committed by Peter Maydell
parent 55efb36519
commit 1a15311a12
2 changed files with 41 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/hw/arm/aspeed.h
View file

@ -19,6 +19,8 @@ typedef struct AspeedBoardState AspeedBoardState;
typedef struct AspeedMachine {
MachineState parent_obj;
bool mmio_exec;
} AspeedMachine;
#define ASPEED_MACHINE_CLASS(klass) \