From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>, Arnd Bergmann <arnd@arndb.de>,
linux-sh@vger.kernel.org
Subject: Re: [PATCH] sh: boot: Remove sh5 cache handling
Date: Mon, 29 Apr 2024 10:22:37 +0200 [thread overview]
Message-ID: <09d677ad889a0bc2d7ae4324e0ca3e90d741b23b.camel@physik.fu-berlin.de> (raw)
In-Reply-To: <CAMuHMdXRDRfTB7WCP8O2ubgN3_9L6Hz2yEcUY3urFksM-2FEmg@mail.gmail.com>
Hi Geert,
On Mon, 2024-04-29 at 10:06 +0200, Geert Uytterhoeven wrote:
> On Mon, Apr 29, 2024 at 9:52 AM John Paul Adrian Glaubitz
> <glaubitz@physik.fu-berlin.de> wrote:
> >
> > Don't have the 32-bit SH CPUs any caches? The code itself is unconditionally executed,
> > it seems.
>
> They do. E.g. SH7751 has 8+8 KiB of L1 cache.
> But e.g. sh7724 has 32+32KiB L1 cache, and 256 KiB of unified L2 cache.
> SH772[34] have l2_cache_init() to enable the L2 cache, so probably they
> boot with L2 disabled, and we are fine.
Understood. But what exactly was the job of cache_control() when all it
does was flushing the cache area? The cache is not enabled or disabled
here, is it?
Also, I was wondering whether this could be related to the boot lockups
that I am seeing on my SH-7786LCR which stops after printing "Uncompressing
Linux...".
I will test later this week whether your patch actually fixes this issue.
> Unfortunately I don't have access to a SH772[34] system.
> Sato-san: can you confirm?
> Thanks!
Yoshinari's input would indeed be valuable here.
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer
`. `' Physicist
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
next prev parent reply other threads:[~2024-04-29 8:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-24 11:54 [PATCH] sh: boot: Remove sh5 cache handling Geert Uytterhoeven
2024-04-29 7:46 ` John Paul Adrian Glaubitz
2024-04-29 7:49 ` Geert Uytterhoeven
2024-04-29 7:52 ` John Paul Adrian Glaubitz
2024-04-29 8:06 ` Geert Uytterhoeven
2024-04-29 8:22 ` John Paul Adrian Glaubitz [this message]
2024-04-29 8:29 ` Geert Uytterhoeven
2024-05-02 13:50 ` Yoshinori Sato
2024-05-01 9:26 ` John Paul Adrian Glaubitz
2024-05-02 7:25 ` Geert Uytterhoeven
2024-05-02 10:32 ` John Paul Adrian Glaubitz
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