From: Timur Tabi <timur@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] Turning on instruction address translation on an 8349 causes processor reset
Date: Tue, 18 Jul 2006 13:54:54 -0500 [thread overview]
Message-ID: <44BD2E7E.2090506@freescale.com> (raw)
I'm working on adding support for a new 8349 board to U-Boot, and the processor resets if I turn on the IR bit in the MSR. This happens in function enable_addr_trans() in start.S.
enable_addr_trans:
/* enable address translation */
mfmsr r5
ori r5, r5, (MSR_IR | MSR_DR)
mtmsr r5
isync
blr
with this code, when the "mtmsr" instruction is executed, the processor resets (or hangs - I can't tell). If I change the 4th line to:
ori r5, r5, MSR_DR
It works and U-Boot boots to a command prompt.
Since the BATs are configured the same for data and instruction, I presume the mapping is correct, but there's something wrong with turning on instruction address translation. Anyone have any ideas?
--
Timur Tabi
Linux Kernel Developer @ Freescale
next reply other threads:[~2006-07-18 18:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-18 18:54 Timur Tabi [this message]
2006-07-19 2:46 ` [U-Boot-Users] Turning on instruction address translation on an 8349 causes processor reset Liu Dave-r63238
2006-07-26 22:04 ` Timur Tabi
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