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发表于 2022-8-11 11:37:08
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板凳
好啦，我自己搞定了：7 p; a; L7 d* j
1、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。
& m2 ?% b n9 n$ nrk_get_eth_addr: rk_vendor_read eth mac address failed (-1)8 r5 ~5 l1 c' d) ?4 P q/ L
rk_get_eth_addr: rk_vendor_write eth mac address failed (-1)/ U5 R2 y2 H' J
rk_get_eth_addr: mac address: cc:10:ad:eb:70:55
) {1 n$ B0 y+ H* j' D- B2、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
" O* g, H5 _8 F) z# E# `1 d9 {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：
( z! ]" e6 m6 {7 N* p: ^/*modified by woodrow*/
( o+ F2 X0 p% Q+ V* Q P union {2 `) n4 T2 o# b/ O
unsigned long ul;! y+ Y9 T* \7 |/ g
unsigned char uc[8];/ S' T, Z5 D+ ^5 J2 v
} cc;$ [2 G, E# F4 c! t5 S% c8 C
//random_ether_addr(addr);9 Q. ]! H2 y3 T$ [0 F
// dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",3 K2 ]9 k: [: i( R5 K: L& [& h* F
// __func__, addr[0], addr[1], addr[2],
0 A" z3 k4 B* U# t) L( i // addr[3], addr[4], addr[5]);
8 f5 k2 n. @% d/ g unsigned long system_low = (unsigned long)system_serial_low;
' T# m1 r8 g8 N unsigned long system_high = (unsigned long)system_serial_high;0 ~, D; ?: Y( Y) Z- r% g
dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);# g( O J! f" T5 p3 T2 V1 {
dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);1 m; @: v# {# o! X$ X1 }
cc.ul = system_low;$ j' ?9 x( f: z, q
addr[0] = 0xcc;2 h1 Z" F. b4 S' Z0 c! O
addr[1] = 0x10;2 d# ^7 u& @2 F4 s a
addr[2] = cc.uc[3];
* w$ l1 \" k* B5 x addr[3] = cc.uc[2];
" v8 U8 S& b0 F1 C* ^ `8 Q" Y2 f, D addr[4] = cc.uc[1];
7 F( C; F! N5 Z+ |1 R* @" `% [ addr[5] = cc.uc[0];" E9 M1 \* X2 | |; x- m( Q
/*modified by woodrow*/! r1 P; Y8 y: w3 {0 u! B' J
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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