bdmr4101

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

BDMR4101
BDMR4101

Description

The BDMR4101 is the evaluation board for the 4101 TinyRISC Processor. It
comes with it's own special power supply.

Memory Map

	RAM	   a000.0000 1MB
		   a100.0000 8MB Module (optional)
	ROM	   bfc0.0000 4 flash sockets U5,U6,U7,U8
	DUART	   be00.0000 2681
	Ethernet   Sonic 10BaseT only

Interrupts

	int0	2681
	int1	Sonic
	int2	SerialICE Port + external pin if CFG:CPC0EN=1
	int3	external pin if CFG:CPC1EN=1
	int4	external pin if CFG:CPC2EN=1
	int5	external pin if CFG:CPC3EN=1

External Connections

	Power - 5V DC via coaxial power connector
	RS232
		J28 ChanA (PMON console)
		J27 ChanB
	SerialICE Port

Clocks

U52Clock for CPU.
U53Clock for SerialICE Port. 
1.8432MHz=115200, 20MHz=1250000.

Jumpers

Jumper In		Jumper Out

J1	Little Endian		Big Endian

J2	Wburstn		-

J3	No Dwrap		Dwrap

J4	No Iwrap		Iwrap

J5-J6	Sram wait states
	
	0 ws (J6=In J5=In)
	1 ws (J6=In J5=Out)
	2 ws (J6=Out J5=In)
	3 ws (J6=Out J5=Out)
	

J7	BCLK=PCLK		BCLK=0.5*PCLK

J8	Arb_mode1		Arb_mode2

J9,J11	Icache refill size
	
	1 word (J9=In J11=In)
	2 word (J9=In J11=Out)
	4 word (J9=Out J11=In)
	8 word (J9=Out J11=Out)
	

J10,J12	Default		-

J13,J15	Dcache refill size
	
	1 word (J13=In J15=In)
	2 word (J13=In J15=Out)
	4 word (J13=Out J15=In)
	8 word (J13=Out J15=Out)
	

J14,J16	Default		-

J17-J18	on board 3.3v		external 3.3v

J19	Default Position 1-2		-

J20		-	Sonic Status

J251-2 SerialICE Port Clock comes from oscillator (U53)
2-3 SerialICE Port Clock comes from SerialICE Port connector.
A board will always transmit it's osc clock to the connector.
It is swapped with the clock input on the other board in the cable.

J26in - J27 (tty1 connector) acts as tty1. SerialICE uses 
SerialICE Port connector.

out - J27 is connected to the SerialICE Port through level translators
and tty1 is unavailable. This requires that the onboard osc be
selected and installed.

IceKernel