From: "Mark Chambers" <markc@mail.com>
To: "Vijay Padiyar" <vijay_padiyar@hotmail.com>,
"LinuxPPC Support" <linuxppc-embedded@ozlabs.org>
Subject: Re: problem with accessing memory mapped area
Date: Fri, 11 Feb 2005 08:27:47 -0500 [thread overview]
Message-ID: <001101c5103d$7ed78470$0301a8c0@chuck2> (raw)
In-Reply-To: BAY1-DAV32181D4E594557F8931608B770@phx.gbl
> In addition, in the address range 0x30000000-0x300000FF, I have a CPLD
> mapped.
>
> Now, I wish to access the registers of this CPLD. For this, I create a
> module and insert it into the kernel. Now, in my 'init_module' function, I
> map the address range 0x30000000-0x300000FF to cpld_mem:
>
> But when I execute this program on the target, it crashes after displaying
> "Writing to CPLD". Sometimes it says 'Bus error' and some other times I
get
> a 'Kernel panic' message and the system reboots.
>
If you are getting 'bus error' it sounds like the memory controller is not
set
up [correctly] for this address. Do you know if the bootloader is
configuring
the CPLD chip select correctly?
prev parent reply other threads:[~2005-02-11 13:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-11 4:37 problem with accessing memory mapped area Vijay Padiyar
2005-02-11 13:27 ` Mark Chambers [this message]
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