From: Roland Dreier <roland@topspin.com>
To: Khai Trinh <kqtrinh@yahoo.com>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: A few questions in embedded linux
Date: 17 Jan 2003 14:47:07 -0800 [thread overview]
Message-ID: <52u1g74cno.fsf@topspin.com> (raw)
In-Reply-To: <20030117223204.83501.qmail@web11507.mail.yahoo.com>
>>>>> "Khai" == Khai Trinh <kqtrinh@yahoo.com> writes:
Khai> Regarding to my question 1 below. After I check and use high
Khai> mem, and CMDLINE="mem=60M", recompile my kernel, static link
Khai> my driver using the 4M reserved RAM space, I got this
Khai> message
Khai> kernel: __ioremap(): phys addr 3c00000 is RAM lr c000a57c
Look at arch/ppc/mm/pgtable.c, where that message is being printed.
The kernel thinks that the address 3c00000 (which is 60 MB) is below
high_memory, which is where it thinks the top of memory is.
The most likely explanation is that you are doing something wrong when
you pass "mem=60M" to the kernel.
Have your driver print out virt_to_phys(high_memory) and check that
the kernel really thinks it only has 60 MB of memory.
- Roland
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next parent reply other threads:[~2003-01-17 22:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20030117223204.83501.qmail@web11507.mail.yahoo.com>
2003-01-17 22:47 ` Roland Dreier [this message]
2003-01-17 18:15 A few questions in embedded linux Khai Trinh
2003-01-17 19:04 ` Kedar Madineni
2003-01-17 19:11 ` Dr. Craig Hollabaugh
2003-01-17 19:22 ` Wolfgang Denk
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