From: Scott Wood <scottwood@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] A question about mpc85xx tlb1
Date: Fri, 16 Mar 2012 13:04:15 -0500 [thread overview]
Message-ID: <4F63809F.6050309@freescale.com> (raw)
In-Reply-To: <CAOwonjznxOJGhXdidgj+oKG2ZZnekJatLw5zNyiaZQv8R2VDeQ@mail.gmail.com>
On 03/16/2012 04:40 AM, ?? wrote:
> Dear list,
>
> In u-boot-2011.12/arch/powerpc/cpu/mpc85xx/cpu_init_early.c , line 151
>
> void cpu_init_early_f(void)
> {
> ...
> invalidate_tlb(1);
>
> ...
> }
>
>
> The tlb1 has beening invalidated int the line 151, but I don't know when
> it was validated again.
> It makes me feel very confused, please help me.
This command invalidates each entry of the TLB1 array that does not have
IPROT set. Ordinarily there are no such entries.
You don't "revalidate" after invalidating a TLB, you just load whatever
entries you want to be there.
-Scott
prev parent reply other threads:[~2012-03-16 18:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-16 9:40 [U-Boot] A question about mpc85xx tlb1 徐阳
2012-03-16 18:04 ` Scott Wood [this message]
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