Changeset 9f8a07d3 in mainline

Timestamp:

2013-01-17T19:58:34Z (12 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

e1530ec2

Parents:

28a6190

Message:

bootloader: add support to the beaglebone UART0

Location:

boot/arch/arm32

Files:

• include/main.h (modified) (1 diff)
• src/putchar.c (modified) (2 diffs)

boot/arch/arm32/include/main.h

@@ -51 +51 @@
 #define BBXM_THR_FULL           0x00000001
 
+/** Beaglebone UART register addresses
+ *
+ * This is UART0 of AM335x CPU
+ */
+#define BBONE_SCONS_THR         0x44E09000
+#define BBONE_SCONS_SSR         0x44E09044
+
+/** Check this bit before writing (tx fifo full) */
+#define BBONE_TXFIFO_FULL       0x00000001
 
 /** GTA02 serial console UART register addresses.

boot/arch/arm32/src/putchar.c

@@ -40 +40 @@
 #include <putchar.h>
 #include <str.h>
+
+#ifdef MACHINE_beaglebone
+
+/** Send a byte to the am335x serial console.
+ *
+ * @param byte          Byte to send.
+ */
+static void scons_sendb_bbone(uint8_t byte)
+{
+        volatile uint32_t *thr =
+                (volatile uint32_t *) BBONE_SCONS_THR;
+        volatile uint32_t *ssr =
+                (volatile uint32_t *) BBONE_SCONS_SSR;
+
+        /* Wait until transmitter is empty */
+        while (*ssr & BBONE_TXFIFO_FULL);
+
+        /* Transmit byte */
+        *thr = (uint32_t) byte;
+}
+
+#endif
 
 #ifdef MACHINE_beagleboardxm
@@ -106 +128 @@
 static void scons_sendb(uint8_t byte)
 {
+#ifdef MACHINE_beaglebone
+        scons_sendb_bbone(byte);
+#endif
 #ifdef MACHINE_beagleboardxm
         scons_sendb_bbxm(byte);