Normally the processor clock has a divisor of 2.
In some cases this this needs to be set to 4.
Check the user has set environment mdiv to 4 to change the divisor.
Signed-off-by: Daniel Gorsulowski <daniel.gorsulow...@esd.eu>
---
v2: - changed and add additional comments
- strengthened string comparision
board/esd/meesc/meesc.c | 26 ++++++++++++++++++++++++++
include/configs/meesc.h | 1 +
2 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/board/esd/meesc/meesc.c b/board/esd/meesc/meesc.c
index efba60d..a1b66cb 100644
--- a/board/esd/meesc/meesc.c
+++ b/board/esd/meesc/meesc.c
@@ -219,6 +219,32 @@ u32 get_board_rev(void)
}
#endif
+#ifdef CONFIG_MISC_INIT_R
+int misc_init_r(void)
+{
+ char *str;
+ char buf[32];
+
+ /*
+ * Normally the processor clock has a divisor of 2.
+ * In some cases this this needs to be set to 4.
+ * Check the user has set environment mdiv to 4 to change the divisor.
+ */
+ if ((str = getenv("mdiv")) && (strcmp(str, "4") == 0)) {
+ at91_sys_write(AT91_PMC_MCKR,
+ (at91_sys_read(AT91_PMC_MCKR) & ~AT91_PMC_MDIV) |
+ AT91SAM9_PMC_MDIV_4);
+ at91_clock_init(0);
+ serial_setbrg();
+ /* Notify the user that the clock is not default */
+ printf("Setting master clock to %s MHz\n",
+ strmhz(buf, get_mck_clk_rate()));
+ }
+
+ return 0;
+}
+#endif /* CONFIG_MISC_INIT_R */
+
int board_init(void)
{
/* Peripheral Clock Enable Register */
diff --git a/include/configs/meesc.h b/include/configs/meesc.h
index b996854..034e81c 100644
--- a/include/configs/meesc.h
+++ b/include/configs/meesc.h
@@ -48,6 +48,7 @@
#define CONFIG_SKIP_LOWLEVEL_INIT
#define CONFIG_SKIP_RELOCATE_UBOOT
+#define CONFIG_MISC_INIT_R /* Call misc_init_r */
#define CONFIG_ARCH_CPU_INIT
--
1.6.1
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