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| author | Cédric Le Goater <clg@kaod.org> | 2020-01-30 16:02:02 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2020-01-30 16:02:02 +0000 |
| commit | 1a15311a12fa6a5c865e7f779e6e1b2557440626 (patch) | |
| tree | 0d267758e85e7738280f1d463bf81a72cc944e14 /linux-headers/asm-generic/mman.h | |
| parent | 55efb365191635d9839600f1f44502769e66aabf (diff) | |
hw/arm/aspeed: add a 'execute-in-place' property to boot directly from CE0
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>
Diffstat (limited to 'linux-headers/asm-generic/mman.h')
0 files changed, 0 insertions, 0 deletions