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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:( E( V. |1 H% h! w
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。
) ?$ X( I, M/ O r; B" K" T2 g0 wrk_get_eth_addr: rk_vendor_read eth mac address failed (-1)
8 S4 T4 o5 @, irk_get_eth_addr: rk_vendor_write eth mac address failed (-1)1 ?8 P) A0 B* }( `
rk_get_eth_addr: mac address: cc:10:ad:eb:70:55
* H6 {* U# C% T% v2、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* V* D0 a" I$ @
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:, g; F1 U. j% L6 a0 j; x4 J9 L
/*modified by woodrow*/
9 ]; }6 j9 a' V: f. b union {$ N% ~9 b- F( J% @5 ?* I4 T
unsigned long ul;
& K4 t( H7 M; [' w( l: K# q6 @& i" T4 @ unsigned char uc[8];
) l B9 t5 \7 F } cc;3 ?. x6 z% S7 j3 k
//random_ether_addr(addr);" b9 J& O+ D' }( e: @3 B& {! H, Z! g
// dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",
. _2 |6 Q: L, D$ c& z // __func__, addr[0], addr[1], addr[2],
5 C3 I- q- ~6 P* [/ D // addr[3], addr[4], addr[5]);, b4 X+ s& V% O- P. G: f
unsigned long system_low = (unsigned long)system_serial_low;! ?& M$ H% \- r. G, c; a; p
unsigned long system_high = (unsigned long)system_serial_high;
9 O* Y W$ i" r dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);# V% E: w! q% G6 |; C( ~
dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);: N0 b" ~( u: D1 o
cc.ul = system_low;
) i6 W' E: V' C1 f) {: ~: S addr[0] = 0xcc;7 A! F2 R9 J& ~
addr[1] = 0x10;- v a0 H _; F' @5 ~
addr[2] = cc.uc[3];
. b/ l* X. q- I addr[3] = cc.uc[2];
$ k- g, v: x# V+ O { addr[4] = cc.uc[1];
* P( N/ r' Y4 u: [% J& U+ q! U addr[5] = cc.uc[0];
9 W- R* U5 x3 g, o& b: g$ a" ^- w" c8 m q/*modified by woodrow*/3 P/ c3 ~/ ]' X/ {' ~3 O
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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