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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：4 A) K" u9 F- F9 \! ?. `5 q
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。3 D7 _# H# P3 }+ b
rk_get_eth_addr: rk_vendor_read eth mac address failed (-1)" f' }3 w* Y1 S a$ S& J, u
rk_get_eth_addr: rk_vendor_write eth mac address failed (-1): ~; n/ J1 G) k' `) s# M
rk_get_eth_addr: mac address: cc:10:ad:eb:70:55
. K4 T; O9 v5 v1 y+ Y7 a2、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5 B y x, Q' c4 g
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：/ c: J9 K" s( e
/*modified by woodrow*/( e9 D3 R4 `& J g6 F
union {& @. G9 u5 ]) \ d$ V# \' w. p
unsigned long ul;# h! l* f; N5 r4 N) W% f
unsigned char uc[8];
) l& w2 W3 A* O) d } cc;6 }0 e Y3 \7 n; X# S
//random_ether_addr(addr);
; O- X3 e; e3 O% r- @, E // dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",
- h% |- p/ r" E7 g // __func__, addr[0], addr[1], addr[2],
# c. I) t/ A' q& q% u1 g- G // addr[3], addr[4], addr[5]);& h3 j+ m- q# [! I2 ?- M
unsigned long system_low = (unsigned long)system_serial_low;
& ^/ E+ |0 X0 [: R unsigned long system_high = (unsigned long)system_serial_high;! c& Q0 O* {; \! m
dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);
' Z0 I, k2 f9 l: E dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);
- `3 M" I: X$ c' W, t( X cc.ul = system_low;
1 i' m9 T Y! D' `$ G* E# ]7 S addr[0] = 0xcc;
4 B8 [% o5 B! `; W9 Z P addr[1] = 0x10;4 D) t+ b. J% p* e+ F5 |
addr[2] = cc.uc[3];
% S9 F% F: v: A; }. I- W addr[3] = cc.uc[2];
8 H# @- i [9 X% k8 {) y& l addr[4] = cc.uc[1];
# F- u; e& V" g4 }9 r! [ addr[5] = cc.uc[0];
& @, A! p4 _' V5 Y3 C/*modified by woodrow*/: C$ J" Y; h7 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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