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Re: [Qemu-devel] [PATCH 2/2] hw/ppc: deprecate the machine type 'prep',


From: Programmingkid
Subject: Re: [Qemu-devel] [PATCH 2/2] hw/ppc: deprecate the machine type 'prep', replaced by '40p'
Date: Fri, 10 Aug 2018 12:17:20 -0400

> On Aug 9, 2018, at 5:35 PM, address@hidden wrote:
> 
> Date: Thu,  9 Aug 2018 22:40:10 +0200
> From: Herv? Poussineau <address@hidden>
> To: address@hidden
> Cc: Mark Cave-Ayland <address@hidden>,        David Gibson
>       <address@hidden>, Alexander Graf <address@hidden>,
>       address@hidden, Herv? Poussineau <address@hidden>
> Subject: [Qemu-devel] [PATCH 2/2] hw/ppc: deprecate the machine type
>       'prep', replaced by '40p'
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=UTF-8
> 
> - prep machine is a fictional machine, so has no specifications. Which
>  devices can be changed/added/removed without impact? Are interrupts
>  correctly mapped?
> - prep firmware (OHW) has support only for IDE drives (no SCSI).
>  Booting from IDE has been broken approximatively 3 years ago, and nobody 
> complained.
> - OHW is limited on IDE boot to a specific set of OS loaders.
>  These operating systems are of the 2004 time frame.
> - OHW can use -kernel. Linux kernel freezes a long time after PS/2 mouse
>  detection, and then screen becomes garbage. This was already broken in
>  QEMU v2.7, 2 years ago, and nobody complained.
> 
> On the other side:
> - 40p is a real machine, so emulation can be checked against
>  hardware specifications
> - OpenBIOS has support for SCSI block devices, including 40p LSI adapter
> - OpenBIOS can start mostly all Linux kernels (including recent ones)
>  and recent operating system (like NetBSD 7.1.2)
> 
> Signed-off-by: Herv? Poussineau <address@hidden>
> ---
> hw/ppc/prep.c | 1 +
> 1 file changed, 1 insertion(+)
> 
> diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c
> index 1558855247..fbcaebabc0 100644
> --- a/hw/ppc/prep.c
> +++ b/hw/ppc/prep.c
> @@ -676,6 +676,7 @@ static void ppc_prep_init(MachineState *machine)
> 
> static void prep_machine_init(MachineClass *mc)
> {
> +    mc->deprecation_reason = "use 40p machine type instead";
>     mc->desc = "PowerPC PREP platform";
>     mc->init = ppc_prep_init;
>     mc->block_default_type = IF_IDE;
> -- 
> 2.11.0

Can a real 40p machine boot Windows NT 4.0 PowerPC?




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