U-boot-2014.10 transplant 17th days ---- add DM9000 Nic support (1), holiday arrangements

U-boot-2014.10 transplant 17th days ---- add DM9000 Nic support (1), holiday arrangements

Many readers should have DM9000 NICs for 2440 of their boards. Take a look at these documents before porting:

DM9000 Chinese manual (details)

This article tells us some knowledge about DM9000 hardware.

In-depth understanding of DM9000 and MINI2440

This article shows how 2440 implements access to DM9000.

How can I determine the IP address of 2440 dm9000?

This article tells us how to determine the address and data port address.

DM9000 datasheet

In datasheet, dm9000 has 4 K Dword (that is, 4 K dual-word, that is, 16 Kbytes ).

The driver of the DM9000 Nic is located in drivers/net/dm9000x. c. It can be seen in the drivers/net/Makefile file:

obj-$(CONFIG_DRIVER_DM9000) += dm9000x.o

CONFIG_DRIVER_DM9000 is a macro definition. If it has a definition, the file will be compiled. Therefore, we define this macro in the include/configs/tq2440.h file:

#define NONE_FLAG 0#if NONE_FLAG  #define CONFIG_CS8900       /* we have a CS8900 on-board */#define CONFIG_CS8900_BASE  0x19000300#define CONFIG_CS8900_BUS16 /* the Linux driver does accesses as shorts */#else#define CONFIG_DRIVER_DM9000#endif

On the tq2440 baseboard schematic, the card-selecting signal line of DM9000 is connected to nGCS4 of 2440. In chapter 5. Memory Controller of 2440datasheet, the base address of nGCS4 is 0x2000 0000.

Continue tomorrow!