From: "Mark A. Greer" <mgreer@mvista.com>
To: trini@mvista.com,
linuxppc-embedded <linuxppc-embedded@lists.linuxppc.org>
Subject: PPC bootloader cache enabling
Date: Tue, 18 Dec 2001 16:57:00 -0700 [thread overview]
Message-ID: <3C1FD7CC.246C3007@mvista.com> (raw)
Tom,
In the bootloader, we enable the L1 instruction cache and disable the L1
data cache. If I understood the manuals correctly:
On a 750 (according to user's manual):
- The cache is unified so even though you have the L1 data cache
disabled, if you have L2 on, data will get cached there.
On a 7400/7410 (according to user's manuals):
- Last sentence in the first paragraph of section 3.7.3.1 states, "if
the L1 data cache is disabled, the L2 cache must also be disabled."
In _setup_L2CR, the L2 cache is invalidated but its then enabled at the
end. Am I missing something or is this a bug in _setup_L2CR? If its a
bug, maybe we should rename it to invalidate_disable_l2 or something
like that?
Mark
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
reply other threads:[~2001-12-18 23:57 UTC|newest]
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