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From: Marek Vasut <marek.vasut@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] EfikaMX: Adjust undocumented magic constant in config file
Date: Thu, 15 Sep 2011 06:16:57 +0200	[thread overview]
Message-ID: <1316060217-5462-1-git-send-email-marek.vasut@gmail.com> (raw)

This magic constant with zero documentation, when it's last 8 bits are set to
0x45, configures correctly the PERCLK dividers. Therefore the I2C operates
correctly when divider computed from PERCLK.

Note: This constant is written to CBCDR register in
arch/arm/cpu/armv7/mx5/lowlevel_init.S, but it's written only once. The register
is accessed three more times in the file, with different values written to it
each time.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
---
 include/configs/efikamx.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/configs/efikamx.h b/include/configs/efikamx.h
index d4e77c2..1fa29d2 100644
--- a/include/configs/efikamx.h
+++ b/include/configs/efikamx.h
@@ -284,6 +284,6 @@
 	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
 
 #define CONFIG_SYS_DDR_CLKSEL		0
-#define CONFIG_SYS_CLKTL_CBCDR		0x59E35100
+#define CONFIG_SYS_CLKTL_CBCDR		0x59E35145
 
 #endif
-- 
1.7.5.4

             reply	other threads:[~2011-09-15  4:16 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-15  4:16 Marek Vasut [this message]
2011-09-22  9:46 ` [U-Boot] [PATCH] EfikaMX: Adjust undocumented magic constant in config file Stefano Babic

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