[U-Boot] [RFC][PATCH 2/8] Add low-level progress indications

[Graeme Russ]

---
 board/eNET/eNET_start16.S   |   66 +++++++++++++++++++++++++++++++++++++++++-
 board/eNET/hardware.h       |   16 ++++++++++
 include/asm-i386/ic/sc520.h |    6 ++++
 3 files changed, 86 insertions(+), 2 deletions(-)

diff --git a/board/eNET/eNET_start16.S b/board/eNET/eNET_start16.S
index 48e4d83..2d7929b 100644
--- a/board/eNET/eNET_start16.S
+++ b/board/eNET/eNET_start16.S
@@ -27,8 +27,7 @@
  * that is used by U-boot to its final destination.
  */
 
-/* #include <asm/ic/sc520_defs.h> */
-
+#include <asm/ic/sc520.h>
 #include "hardware.h"
 
 .text
@@ -60,6 +59,69 @@ board_init16:
 	xorw    %ax, %ax
 	movb    %al, (%di)
 
+	/* Enable UART 1 */
+	movl    $SC520_ADDDECCTL, %edi
+	movb    $0x02, %al
+	movb    %al, (%di)
+
+	/* Configure UART 1 - 9600 Baud 8N1 */
+	movl    $SC520_UART1CTL, %edi
+	movb    $0x07, %al
+	movb    %al, (%di)
+
+	/* Set DLAB bit */
+	movw    $(UART0_BASE + UART_LCR), %dx
+	movb    $0x80, %al
+	outb    %al, %dx
+
+	/* Set baudrate divisor (LSB) */
+	movw    $(UART0_BASE + UART_DLL), %dx
+	movb    $0x0c, %al
+	outb    %al, %dx
+
+	/* Set baudrate divisor (MSB) */
+	movw    $(UART0_BASE + UART_DLM), %dx
+	movb    $0x00, %al
+	outb    %al, %dx
+
+	/* clear DLAB; set 8 bits, no parity */
+	movw    $(UART0_BASE + UART_LCR), %dx
+	movb    $0x03, %al
+	outb    %al, %dx
+
+	/* enable FIFO */
+	movw    $(UART0_BASE + UART_FCR), %dx
+	movb    $0x01, %al
+	outb    %al, %dx
+
+	/* Set DTR and RTS active */
+	movw    $(UART0_BASE + UART_MCR), %dx
+	movb    $0x0b, %al
+	outb    %al, %dx
+
+	/* clear line status */
+	movw    $(UART0_BASE + UART_LSR), %dx
+	inb     %dx, %al
+
+	/* read receive buffer */
+	movw    $(UART0_BASE + UART_RBR), %dx
+	inb     %dx, %al
+
+	/* set scratchpad */
+	movw    $(UART0_BASE + UART_SCR), %dx
+	movb    $0x00, %al
+	outb    %al, %dx
+
+	/* Disable Interrupts */
+	movw    $(UART0_BASE + UART_IER), %dx
+	movb    $0x00, %al
+	outb    %al, %dx
+
+	/* wait for the UART clock to settle */
+	movl    $0x10000,%ecx
+uartdelay:
+	loop    uartdelay
+
 	/* Disabe MMCR alias */
 	movw	$0xfffc, %dx
 	movl	$0x000000cb, %eax
diff --git a/board/eNET/hardware.h b/board/eNET/hardware.h
index 42474a6..d85fde0 100644
--- a/board/eNET/hardware.h
+++ b/board/eNET/hardware.h
@@ -32,4 +32,20 @@
 #define LED_TX_BITMASK		0x10
 #define LED_ERR_BITMASK		0x20
 
+/* Serial Port Definitions */
+#define UART0_BASE             0x3f8
+
+#define UART_RBR               0x00
+#define UART_THR               0x00
+#define UART_IER               0x01
+#define UART_IIR               0x02
+#define UART_FCR               0x02
+#define UART_LCR               0x03
+#define UART_MCR               0x04
+#define UART_LSR               0x05
+#define UART_MSR               0x06
+#define UART_SCR               0x07
+#define UART_DLL               0x00
+#define UART_DLM               0x01
+
 #endif /* HARDWARE_H_ */
diff --git a/include/asm-i386/ic/sc520.h b/include/asm-i386/ic/sc520.h
index 57c9904..72e5d5d 100644
--- a/include/asm-i386/ic/sc520.h
+++ b/include/asm-i386/ic/sc520.h
@@ -257,10 +257,16 @@ extern volatile sc520_mmcr_t *sc520_mmcr;
 
 /* MMCR Offsets (required for assembler code */
 #define SC520_DBCTL		0x0040	/* SDRAM Buffer Control Register */
+#define SC520_ADDDECCTL		0x0080
 #define SC520_PAR14		0x00c0	/* Programmable Address Region 14 Register */
 #define SC520_PAR15		0x00c4	/* Programmable Address Region 15 Register */
 #define SC520_SWTMRMILLI	0x0c60  /* Software Timer Millisecond Count */
 #define SC520_SWTMRMICRO	0x0c62  /* Software Timer Microsecond Count */
+#define SC520_UART1CTL		0x0cc0  /* UART 1 Control */
+
+ /* MMCR Register bits (not all of them :) ) */
+
+
 
 /* MMCR Register bits (not all of them :) ) */
 
-- 
1.6.4.1.174.g32f4c