bdmr4102

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

BDMR4102
BDMR4102

Description

The BDMR4102 is the evaluation board for the 4102 TinyRISC Processor. It
comes with it's own special power supply.

Memory Map

On the LR4102, the memory map is determined by how the chip-select
registers have been programmed.  The only thing that's fixed is the GP
number to which each peripheral is connected.

	RAM	   GP3 SRAM 128KB
		   GP2 SDRAM 16MB Module (optional) (must be located
		   on a 32MB boundary).
	ROM	   GP0 1 eprom socket
		   bfd0.0000 when not configured as boot device
	DUART	   GP4 16550
	Flash	   GP0 29F080 1MB. 
		   bfd0.0000 when not configured as boot device
	Ethernet   PCI AMD 79C970A 10BaseT only

Interrupts

	int0	?
	int1	timer0
	int2	SerialICE Port
	int3	timer1+(16550 scr1:cpc1en=1)
	int4	Am79C970A Ethernet
	int5	?

External Connections

	Power - 5V DC via coaxial power connector
	RS232
		J10 16550 (PMON console)
		J9  SerialICE Port via level shifters
	SerialICE 
		J8 SerialICE Port direct

Clocks

U?Clock for CPU.
U6Clock for SerialICE Port. 
1.8432MHz=115200, 20MHz=1250000.

Jumpers

Jumper In		Jumper Out

JP6	Little Endian		Big Endian

JP9	Boot from EPROMBoot from flash

JP15
1-2 - J9 is connected to the SerialICE Port through level translators.
This requires that the onboard osc be selected and installed.

2-3 - Connect J8 (the SerialICE header) to the SerialICE Port. 

JP161-2 SerialICE Port Clock comes from oscillator (U6)
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.

IceKernel