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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:
# G7 l& j8 s7 v) k1 j1、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。. A; o2 o( _6 b; k1 e8 v* M
rk_get_eth_addr: rk_vendor_read eth mac address failed (-1)$ n% q) r' k& |, ^- q* c
rk_get_eth_addr: rk_vendor_write eth mac address failed (-1)
9 f! h4 W/ s) Z6 m4 h4 irk_get_eth_addr: mac address: cc:10:ad:eb:70:552 {( K" {# ~" z% |, v# s
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7 Q8 G' n1 h; j. q/ ]3 Z
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:; ?* I" @; k9 E
/*modified by woodrow*/
8 d* Y: [" E( I" [+ ` union {. {- _. g/ a2 B N4 i K9 U# G
unsigned long ul;% e" r5 x& ^0 a" W& f) @
unsigned char uc[8];! s0 h7 u( m h5 _
} cc;0 a0 |5 K8 Q9 ]1 h
//random_ether_addr(addr);0 `+ B! A: p) D3 `$ h
// dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",$ R2 Q& p# V* d; o5 T( D2 \
// __func__, addr[0], addr[1], addr[2],7 b d2 Z/ N# T
// addr[3], addr[4], addr[5]);
; e9 w& J& |: ~8 E/ b0 _ unsigned long system_low = (unsigned long)system_serial_low;
# ?6 H; m' w9 T# o unsigned long system_high = (unsigned long)system_serial_high;: a: u, \) Y0 f& d
dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);
. y% [* @& y" ~5 U$ } dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);
# @8 Y$ ?; B) B2 t cc.ul = system_low;2 O. k% h1 F/ k3 r/ G! e
addr[0] = 0xcc;
" a2 S0 H8 k' [- Z0 W& W addr[1] = 0x10;
7 O5 V3 e4 P' I8 F addr[2] = cc.uc[3];
2 }% M9 m" j1 [7 `! P$ D) R' I addr[3] = cc.uc[2];2 P/ e$ _/ I& S6 b1 i1 N5 O
addr[4] = cc.uc[1];
" V. h" \, F4 w addr[5] = cc.uc[0];& r- n9 [% O& L1 S0 W
/*modified by woodrow*/2 F1 N) Y3 ^+ b2 u$ r: {
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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