CONFIG_MONITOR_IS_IN_RAM is broken for MCF532x. This patch fixes this
by conditionally
- removing the vector table at the beginning of code
- not overwriting the vector base register
- removing the code to re-set the PLL, which effectively disables
SDRAM access
Signed-off-by: Wolfgang Wegner <w.weg...@astro-kom.de>
---
This patch is the coldfire-relevant part of
"[PATCH] allow MCF532x to use CONFIG_MONITOR_IS_IN_RAM" dated 16.02.2010
to allow integration by the coldfire maintainer independent of CFI stuff.
cpu/mcf532x/speed.c | 3 +++
cpu/mcf532x/start.S | 4 ++++
2 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/cpu/mcf532x/speed.c b/cpu/mcf532x/speed.c
index 0d378e6..67f08c7 100644
--- a/cpu/mcf532x/speed.c
+++ b/cpu/mcf532x/speed.c
@@ -204,6 +204,8 @@ int clock_pll(int fsys, int flags)
fout = ((fref * mfd) / (BUSDIV * 4));
#endif
+/* must not tamper with SDRAMC if running from SDRAM */
+#if !defined(CONFIG_MONITOR_IS_IN_RAM)
/*
* Check to see if the SDRAM has already been initialized.
* If it has then the SDRAM needs to be put into self refresh
@@ -254,6 +256,7 @@ int clock_pll(int fsys, int flags)
/* wait for DQS logic to relock */
for (i = 0; i < 0x200; i++) ;
+#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */
return fout;
}
diff --git a/cpu/mcf532x/start.S b/cpu/mcf532x/start.S
index ff13a9f..5b134aa 100644
--- a/cpu/mcf532x/start.S
+++ b/cpu/mcf532x/start.S
@@ -45,6 +45,7 @@
addl #60,%sp; /* space for 15 regs */ \
rte;
+#if !defined(CONFIG_MONITOR_IS_IN_RAM)
.text
/*
* Vector table. This is used for initial platform startup.
@@ -121,6 +122,7 @@ vector192_255:
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
+#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */
.text
@@ -130,9 +132,11 @@ _start:
nop
move.w #0x2700,%sr /* Mask off Interrupt */
+#if !defined(CONFIG_MONITOR_IS_IN_RAM)
/* Set vector base register at the beginning of the Flash */
move.l #CONFIG_SYS_FLASH_BASE, %d0
movec %d0, %VBR
+#endif
move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
movec %d0, %RAMBAR1
--
1.5.6.5
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