linux-kernel - Re: [PATCH v5 01/22] sh: Add sh-specific early_init_dt_reserve_memory

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Date:	Wed, 06 Jul 2016 22:53:23 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Rich Felker <dalias@...c.org>
Cc:	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 01/22] sh: Add sh-specific early_init_dt_reserve_memory_arch

On Mon, 04 Jul 2016 11:03:50 +0900,
Rich Felker wrote:
> 
> On Mon, Jul 04, 2016 at 01:46:21AM +0900, Yoshinori Sato wrote:
> > sh used P1 address space in early device tree.
> > So need convert P1 to physical address before reserve memory.
> > 
> > Signed-off-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> > ---
> >  arch/sh/boards/of-generic.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/arch/sh/boards/of-generic.c b/arch/sh/boards/of-generic.c
> > index 57d45dc..8dbf978 100644
> > --- a/arch/sh/boards/of-generic.c
> > +++ b/arch/sh/boards/of-generic.c
> > @@ -15,6 +15,7 @@
> >  #include <linux/clocksource.h>
> >  #include <linux/irqchip.h>
> >  #include <linux/clk-provider.h>
> > +#include <linux/memblock.h>
> >  #include <asm/machvec.h>
> >  #include <asm/rtc.h>
> >  
> > @@ -203,3 +204,14 @@ static int __init sh_of_device_init(void)
> >  	return 0;
> >  }
> >  arch_initcall_sync(sh_of_device_init);
> > +
> > +int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
> > +					     phys_addr_t size, bool nomap)
> > +{
> > +	if (nomap)
> > +		return memblock_remove(base, size);
> > +
> > +	if (base >= P1SEG)
> > +		base &= ~P1SEG;
> > +	return memblock_reserve(base, size);
> > +}
> > -- 
> 
> I think we need a consistent form of physical memory addressing in the
> DT that doesn't require this. Hard-coding details of the segmented
> memory model all over the place does not look like a good idea; it's
> going to badly break anything with full 32-bit which I believe some
> SH-4 models had (those with PMB?) and which J3/J4 will almost
> certainly have.

Even 32 bits mode are assigned to the same area now.
But lookup PMB more better.

It add "#ifdef CONFIG_29BIT".
Thanks.

> Rich
> --
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-- 
Yoshinori Sato
<ysato@...rs.sourceforge.jp>