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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:
# S: t. @0 U6 `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。! r3 ]3 P9 s0 Y& K
rk_get_eth_addr: rk_vendor_read eth mac address failed (-1)7 Z% I& a' H4 p6 l5 _
rk_get_eth_addr: rk_vendor_write eth mac address failed (-1)
6 n# u+ T5 G' ark_get_eth_addr: mac address: cc:10:ad:eb:70:558 ^- b0 s& i1 o1 _% @' u t
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
/ e# J5 c3 w& J2 k% l2 Y8 N2 ?% }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:4 E3 z3 U( |0 |$ t/ Y) q3 X9 A
/*modified by woodrow*/9 S$ N: R# F; y; o9 D/ j
union {; |, J2 k g3 a8 U
unsigned long ul;' b4 ~! N8 {2 d8 T3 l- u: c
unsigned char uc[8];
& h$ m8 K* P& _7 N& V; [/ h } cc;
, ]/ k0 H9 F$ K0 q //random_ether_addr(addr);- o- s1 w" D% a$ X- D' T6 ^! d- J
// dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",
' y* [, H. S& w U! |; N // __func__, addr[0], addr[1], addr[2],$ J6 d0 c' n3 E
// addr[3], addr[4], addr[5]);. @; u: X! L1 t3 u! R4 F
unsigned long system_low = (unsigned long)system_serial_low;
7 t$ l; i# o) w unsigned long system_high = (unsigned long)system_serial_high;
/ y) C- v5 s* |* K0 k( I dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);' \! m0 p) c: U P
dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);/ }% L) ]/ h P3 X$ J1 y
cc.ul = system_low;
+ @% _; b4 {5 k9 E addr[0] = 0xcc;7 o8 A/ d8 p7 s7 O1 O7 l
addr[1] = 0x10;; w, a2 Q( I, y3 Z# ]
addr[2] = cc.uc[3];/ r( z) w p* R4 d" [
addr[3] = cc.uc[2];3 X; c( i( o1 j/ ? D) j
addr[4] = cc.uc[1];. @& t) m0 ], d6 f* n$ X
addr[5] = cc.uc[0];
, W- V7 m/ x' U. d# c) p* A" B/*modified by woodrow*/( }3 u4 H+ V& m C0 t0 n9 Q5 |/ e4 h
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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