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发表于 2022-8-11 11:37:08
只看该作者
板凳
好啦，我自己搞定了：
/ n4 a6 C, l0 p3 g4 C+ p* 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。/ P% w. F5 R/ z2 a4 B+ |7 E8 [
rk_get_eth_addr: rk_vendor_read eth mac address failed (-1)
l& K. {$ Y# i# l E: @rk_get_eth_addr: rk_vendor_write eth mac address failed (-1)' k8 r" f. n, L
rk_get_eth_addr: mac address: cc:10:ad:eb:70:559 L6 l* K5 u% c$ y' o. S* V2 l
2、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; J+ s4 R" A+ ]' ^" q- J6 I9 [! t
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：
1 Q. t8 K6 V9 n* q% W/*modified by woodrow*/
: W( P8 l: _; ]) y7 f& u0 Y6 T6 C union {2 H5 k- F) H# s# ^8 n" w0 ?! k
unsigned long ul;; {5 S, S8 ~1 l9 y3 h! V, Z& f9 c
unsigned char uc[8];
3 |' P) D( ^7 v; M8 y5 `! f } cc;
! D% g) ^1 r9 n# t //random_ether_addr(addr);
6 u1 }4 C7 c$ c2 ]( } { // dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",
b' T3 i# `) b: E // __func__, addr[0], addr[1], addr[2],' S3 Y% |- p. \; w$ s g6 `2 g; p# t
// addr[3], addr[4], addr[5]);
+ [& E+ G( n3 \5 o9 F q unsigned long system_low = (unsigned long)system_serial_low;. @8 a& m. B) N5 |
unsigned long system_high = (unsigned long)system_serial_high;& j/ o- |" W) M
dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);
; m: n9 c( `1 j% J+ }. S! ~ dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);
, F7 {+ T9 u' j( H3 G! t# r: A cc.ul = system_low;5 ?9 A( m8 E7 A4 B, h8 p
addr[0] = 0xcc;
@2 x" Z- E# R: w addr[1] = 0x10;
/ U# z$ u& }$ O8 w addr[2] = cc.uc[3];& F* N. r4 }" @! E M0 ?
addr[3] = cc.uc[2];( k6 C& @ M: y \
addr[4] = cc.uc[1];7 |9 X) \2 c5 h7 i% T
addr[5] = cc.uc[0];% T" k0 t6 E% _% U e6 V) z k8 z- w
/*modified by woodrow*/
2 f. _' k' o/ f w5 D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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