请问rtl8139中，如何访问serial EEPROM?

请问rtl8139中，如何访问serial EEPROM啊
/* Serial EEPROM section. */

/*  EEPROM_Ctrl bits. */
#define EE_SHIFT_CLK 0x04 /* EEPROM shift clock. */
#define EE_CS 0x08 /* EEPROM chip select. */
#define EE_DATA_WRITE 0x02 /* EEPROM chip data in. */
#define EE_WRITE_0 0x00
#define EE_WRITE_1 0x02
#define EE_DATA_READ 0x01 /* EEPROM chip data out. */
#define EE_ENB (0x80 | EE_CS)

/* Delay between EEPROM clock transitions.
   No extra delay is needed with 33Mhz PCI, but 66Mhz may change this.
 */

#define eeprom_delay() inl(ee_addr)

/* The EEPROM commands include the alway-set leading bit. */
#define EE_WRITE_CMD (5)
#define EE_READ_CMD (6)
#define EE_ERASE_CMD (7)

static int read_eeprom(long ioaddr, int location, int addr_len)
{
int i;
unsigned retval = 0;
long ee_addr = ioaddr + Cfg9346;
int read_cmd = location | (EE_READ_CMD << addr_len);

outb(EE_ENB & ~EE_CS, ee_addr);
outb(EE_ENB, ee_addr);

/* Shift the read command bits out. */
for (i = 4 + addr_len; i >= 0; i--) {
int dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
outb(EE_ENB | dataval, ee_addr);
eeprom_delay();
outb(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr);
eeprom_delay();
}
outb(EE_ENB, ee_addr);
eeprom_delay();

for (i = 16; i > 0; i--) {
outb(EE_ENB | EE_SHIFT_CLK, ee_addr);
eeprom_delay();
retval = (retval << 1) | ((inb(ee_addr) & EE_DATA_READ) ? 1 : 0);
outb(EE_ENB, ee_addr);
eeprom_delay();
}

/* Terminate the EEPROM access. */
outb(~EE_CS, ee_addr);
return retval;
}

EE_WRITE_CMD,EE_READ_CMD,EE_ERASE_CMD是干什么的呀？
EEPROM的地址空间是怎样的？
rtl8139B中有几个地址空间？
谢谢！

网卡的eeprom用的一般都是3线（EECS, EECLK, EEIO，也就是Microwire总线）的串行eeprom
其中最常用的就是93cXX系列，rtl8139中存取eeprom用到的就是ee_addr = ioaddr + Cfg9346寄存器
bit7   6    5   4     3      2       1     0
  1    x    x   x    EECS    EECLK  EEDI   EEDO

关于eeprom的读写可参看附件
或下载地址：http://www.laogu.com/script/display.asp?Did=235

我已经明白了，不过还是要谢谢你！
由于放寒假，没有及时地给分，I am sorry.
祝你春节愉快！

有8139的驱动manual么？有的话给我一份，谢谢
callmefire@sina.com

是要8139的LINUX源代码还是8139的芯片资料？

怎么下不了了