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发表于 2022-8-11 11:37:08
板凳
好啦,我自己搞定了:
- K* e+ [6 p- F5 h3 A) u7 O1、小板子上执行 dmesg | grep mac,找到大致下面信息,发现mac地址的获取是通过rk_get_eth_addr这个函数。
: ^/ l( Y4 t4 o1 ork_get_eth_addr: rk_vendor_read eth mac address failed (-1). E' ]* P( m; ^& t: J! s( \! _" Q
rk_get_eth_addr: rk_vendor_write eth mac address failed (-1)
$ |& F$ i4 s, T, a0 D! Y3 h7 g ?6 ?' wrk_get_eth_addr: mac address: cc:10:ad:eb:70:55
; t6 K2 C6 X: [% J, i" S& y2、执行grep rk_get_eth_addr -r ./ 定位rk_get_eth_addr函数在kernel/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c文件里) A5 Q- Q: ^0 T3 x& y
3、找到这个函数,在if (ret != 6 || is_zero_ether_addr(addr)) {这段代码的后面加上这些内容:0 ^2 U5 W1 b' X6 P, h
/*modified by woodrow*/4 K v4 j' w1 m6 d1 A- W( t
union {
) r* ^- T w5 T2 l unsigned long ul;) h. z# a/ q& D' h
unsigned char uc[8];
1 t( y% X2 [9 v5 P } cc;
+ O1 i& n9 k+ { _+ @ //random_ether_addr(addr);
# H e; c1 `# q& J# b; U7 O // dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",
' s2 [; h" a# x! n // __func__, addr[0], addr[1], addr[2],* Q$ x/ I4 ~) F) u8 ~% d y3 Z- o
// addr[3], addr[4], addr[5]);* E3 c9 e7 v( k3 t
unsigned long system_low = (unsigned long)system_serial_low;3 Y& e8 T9 T n9 N' {
unsigned long system_high = (unsigned long)system_serial_high;# s4 G* x6 X" \; Z0 Z9 k
dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);
6 B/ L- b& t# e4 L5 T5 h/ _1 ~. | dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);* g j5 E' G$ s1 N( }5 A! B( L
cc.ul = system_low;, x$ ^* m2 ^0 i/ a& y8 d
addr[0] = 0xcc;
( \+ ?2 C( K: Q3 f. G9 [5 i addr[1] = 0x10;
, j( q" |& t% ~2 E& p! M! U, k J addr[2] = cc.uc[3];( c0 W) x; M, V- @5 G* D7 ?% u
addr[3] = cc.uc[2];
5 P5 W1 T6 }- v, c addr[4] = cc.uc[1];5 y7 D. j, n. I: D, \4 W% Q
addr[5] = cc.uc[0];
0 o8 i" F# Y% S- m+ m/*modified by woodrow*/
: _7 G8 R c' f% x这段代码的用途是,当没有在vendor_storage里读到mac地址的时候,不是随机产生一个mac地址,而是将cpu序列号作为mac地址的一部分。cpu序列号:system_serial_low和system_serial_high是2个全局变量,需要引入头文件:#include <asm/system_info.h>才能使用。 |
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