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Re: [PATCH] Changes to support booting NetBSD/alpha
From: |
Richard Henderson |
Subject: |
Re: [PATCH] Changes to support booting NetBSD/alpha |
Date: |
Wed, 14 Oct 2020 15:01:05 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 10/6/20 8:24 PM, Jason Thorpe wrote:
> Along with the previous patch set for qemu-palcode, these changes
> allow NetBSD/alpha to run in qemu-system-alpha.
>
> - Allow a the minimum PCI device number to be passed to typhoon_init().
> Use this to specify a minimum PCI device number of 1 in the Clipper
> system emulation, since that's the lowest PCI device number with
> valid interrupt mappings on that system.
> - Instead of passing just the CPU count in trap_arg2, also pass other
> configuration information. Define the first config bit (bit 6) to
> reflect the "-nographic" option; PALcode will use this to initialize
> the Console Terminal Block to specify serial console.
> - Attach a minimal i82378 SIO PCI node; some operating systems won't
> scan for ISA devices unless a PCI-ISA bridge is detected. Real hardware
> would have had a Cypress or ALI bridge, but many Alpha models shipped
> with a i82378, and most operating sytems are not picky about the specific
> model.
> - Modify the mc146818rtc emulation to ensure the timer is started as soon
> as the device is realized, and update the PF bit in REG_C even if it is
> not going to result in raising an interrupt, as the real hardware does.
>
This will have to be split up -- again, essentially by bullet point -- but it
looks reasonable enough.
You need to mind CODING_STYLE. Run your patches through
./scripts/checkpatch.pl for a rough guide.
r~