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-rw-r--r--CHANGELOG6
-rw-r--r--cpu/nios2/epcs.c15
-rw-r--r--include/nios2-epcs.h5
-rw-r--r--lib_nios2/board.c10
4 files changed, 36 insertions, 0 deletions
diff --git a/CHANGELOG b/CHANGELOG
index 5480a69..547f90c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,12 @@
Changes since U-Boot 1.1.4:
======================================================================
+* Nios II - Add EPCS Controller bootrom work-around
+ -When booting from an epcs controller, the epcs bootrom may leave the
+ slave select in an asserted state causing soft reset hang. This
+ patch ensures slave select is negated at reset.
+ Patch by Scott McNutt, 08 Jun 2006
+
* Update PK1C20 board
-Update base addresses for standard configuration
-Eliminate use of CACHE_BYPASS in board code
diff --git a/cpu/nios2/epcs.c b/cpu/nios2/epcs.c
index fd9fd84..414c38c 100644
--- a/cpu/nios2/epcs.c
+++ b/cpu/nios2/epcs.c
@@ -210,6 +210,21 @@ static struct epcs_devinfo_t devinfo[] = {
{ 0, 0, 0, 0, 0, 0 }
};
+int epcs_reset (void)
+{
+ /* When booting from an epcs controller, the epcs bootrom
+ * code may leave the slave select in an asserted state.
+ * This causes two problems: (1) The initial epcs access
+ * will fail -- not a big deal, and (2) a software reset
+ * will cause the bootrom code to hang since it does not
+ * ensure the select is negated prior to first access -- a
+ * big deal. Here we just negate chip select and everything
+ * gets better :-)
+ */
+ epcs_cs (0); /* Negate chip select */
+ return (0);
+}
+
epcs_devinfo_t *epcs_dev_find (void)
{
unsigned char buf[4];
diff --git a/include/nios2-epcs.h b/include/nios2-epcs.h
index 2c9522c..20e0c87 100644
--- a/include/nios2-epcs.h
+++ b/include/nios2-epcs.h
@@ -38,6 +38,11 @@ typedef struct epcs_devinfo_t {
unsigned char prot_mask; /* Protection mask */
}epcs_devinfo_t;
+/* Resets the epcs controller -- to prevent (potential) soft-reset
+ * problems when booting from the epcs controller
+ */
+extern int epcs_reset (void);
+
/* Returns the devinfo struct if EPCS device is found;
* NULL otherwise.
*/
diff --git a/lib_nios2/board.c b/lib_nios2/board.c
index cd23037..7ffb3f0 100644
--- a/lib_nios2/board.c
+++ b/lib_nios2/board.c
@@ -31,6 +31,9 @@
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#endif
+#if defined(CFG_NIOS_EPCSBASE)
+#include <nios2-epcs.h>
+#endif
DECLARE_GLOBAL_DATA_PTR;
@@ -93,6 +96,9 @@ init_fnc_t *init_sequence[] = {
#if defined(CONFIG_BOARD_EARLY_INIT_F)
board_early_init_f, /* Call board-specific init code early.*/
#endif
+#if defined(CFG_NIOS_EPCSBASE)
+ epcs_reset,
+#endif
env_init,
serial_init,
@@ -165,6 +171,10 @@ void board_init (void)
WATCHDOG_RESET ();
interrupt_init ();
+#if defined(CONFIG_BOARD_LATE_INIT)
+ board_late_init ();
+#endif
+
/* main_loop */
for (;;) {
WATCHDOG_RESET ();