From: Antonio Di Bacco <dibacco@libero.it>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] U-Boot wrong cpu frequency calculation when setting PLPRCR directly
Date: Sat, 20 Jan 2007 09:45:00 +0100 [thread overview]
Message-ID: <eoskgd$52a$1@sea.gmane.org> (raw)
Hi all,
I setup the cpu frequency of a Freescale MPC880 directly providing a value
for the PLPRCR register. When the u-boot (1.2.0 and previous) starts, in
file speed.c it makes a calculation to display the CPU frequency based on
fields in PLPRCR. Working with integers it makes an approximation that
leads to a wrong cpu frequency in my case 130 Mhz instead of 132 Mhz). As a
consequence my clock was wrong gaining 20 minutes per day. It is easy to
patch the problem. If someone is interested I'll give him the patch.
Bye,
Antonio.
next reply other threads:[~2007-01-20 8:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-20 8:45 Antonio Di Bacco [this message]
2007-01-20 17:03 ` [U-Boot-Users] U-Boot wrong cpu frequency calculation when setting PLPRCR directly Markus Klotzbücher
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