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Re: [Qemu-devel] [PATCH v2 04/11] hw/arm/aspeed: add a 'execute-in-place
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH v2 04/11] hw/arm/aspeed: add a 'execute-in-place' property to boot directly from CE0 |
Date: |
Tue, 2 Oct 2018 11:49:45 +0100 |
On 21 September 2018 at 17:19, Cédric Le Goater <address@hidden> wrote:
> 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 <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
thanks
-- PMM
- Re: [Qemu-devel] [PATCH v2 04/11] hw/arm/aspeed: add a 'execute-in-place' property to boot directly from CE0,
Peter Maydell <=