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Date: Wed, 07 Jan 2009 23:50:54 +0100
From: "Gerhard Pircher" <gerhard_pircher@gmx.net>
Message-ID: <20090107225054.23010@gmx.net>
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Subject: Re: [PATCH 1/5] powerpc: Add platform support for AmigaOne
To: Scott Wood <scottwood@freescale.com>
Cc: linuxppc-dev@ozlabs.org
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-------- Original-Nachricht --------
> Datum: Wed, 7 Jan 2009 13:07:18 -0600
> Von: Scott Wood <scottwood@freescale.com>
> An: Gerhard Pircher <gerhard_pircher@gmx.net>
> CC: linuxppc-dev@ozlabs.org
> Betreff: Re: [PATCH 1/5] powerpc: Add platform support for AmigaOne

> On Wed, Jan 07, 2009 at 02:54:57PM +0100, Gerhard Pircher wrote:
> > +void amigaone_show_cpuinfo(struct seq_file *m)
> > +{
> > +	struct device_node *root;
> > +	const char *model = "";
> > +
> > +	root = of_find_node_by_path("/");
> > +	if (root)
> > +		model = of_get_property(root, "model", NULL);
> > +	seq_printf(m, "machine\t\t: %s\n", model);
> > +
> > +	of_node_put(root);
> > +	return;
> 
> This is already printed by the generic cpuinfo.
I'll remove that. Is a vendor or machine entry actually required?
IIRC the debian-installer parses the machine entry.

> > +void __init amigaone_setup_arch(void)
> > +{
> > +	struct device_node *np;
> > +
> > +	/* Initialization until calibrate_delay() runs. */
> > +	loops_per_jiffy = 50000000/HZ;
> 
> Is this really necessary?
Don't think so. It's a leftover from the CHRP setup code.

> > +	/* Flush and disable I/D cache. */
> > +	__asm__ __volatile__ ("mfspr	3, 1008"	::: "r3");
> > +	__asm__ __volatile__ ("ori	5, 5, 0xcc00"	::: "r5");
> > +	__asm__ __volatile__ ("ori	4, 3, 0xc00"	::: "r4");
> > +	__asm__ __volatile__ ("andc	5, 3, 5"	::: "r5");
> 
> Don't do this; instead, have one multi-line asm statement (or better yet,
> just use mfspr()/mtspr()/sync()/isync()).
> 
> GCC is perfectly free to trash your registers in between statements.
Okay, I'll try to rewrite it with mfspr() and friends (I don't understand gcc's
assembler syntax yet).

Thanks!

Gerhard

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