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发表于 2022-8-11 11:37:08
板凳
好啦，我自己搞定了：
& c# Q; x4 { M9 u$ K( w; n4 I2 R1、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。
1 w! z6 V2 K' L3 D# m6 r6 hrk_get_eth_addr: rk_vendor_read eth mac address failed (-1)
0 Y0 d) {5 ^6 m2 t+ w) l. erk_get_eth_addr: rk_vendor_write eth mac address failed (-1)
( M8 h: J- b: V, Crk_get_eth_addr: mac address: cc:10:ad:eb:70:55
, _4 M' E( r9 A7 I4 m9 H2、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9 k8 V1 q$ T. M4 s2 f/ @
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：. J3 s; P+ s' z0 r: b
/*modified by woodrow*/
& [% D; ?3 c& g- Z/ r union {
& p- [: E5 E. f unsigned long ul;
7 }/ V ^5 [9 w, x$ L& } unsigned char uc[8];: E. z4 i' H! A! m2 X6 ~
} cc;
9 u4 q. j0 g0 r4 V+ Z! c //random_ether_addr(addr);
7 G, P5 R L! R P, X( p0 T // dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",/ @4 a3 A @% q8 w5 v: K; }& |
// __func__, addr[0], addr[1], addr[2],4 U# a# j0 Z, C# R a
// addr[3], addr[4], addr[5]);
1 w. ^% r+ k% s/ D4 _( f5 n2 l unsigned long system_low = (unsigned long)system_serial_low;
; ^1 x' ^' T/ {1 u, k1 g unsigned long system_high = (unsigned long)system_serial_high;7 ]$ a# r1 q+ v
dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);
" ]! _: V p7 R7 \ dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);
! t" R5 d, C- } |2 C* ], o0 U1 L cc.ul = system_low;. B; O# |: t( Q) Q
addr[0] = 0xcc;1 I! j1 f9 N: [, I* z
addr[1] = 0x10;
: _( S/ \0 @) L$ Z. y U' N addr[2] = cc.uc[3];4 I8 `* q: f- K* E' |% S, u
addr[3] = cc.uc[2];" B* {; T# n+ @$ |4 _
addr[4] = cc.uc[1];
/ ]6 y- L/ v# v! ?$ O" X4 p+ Z addr[5] = cc.uc[0];8 k/ f5 T: ~7 G, }7 I7 x
/*modified by woodrow*/
6 N; `& A+ J9 g: {( 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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