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.wegner@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