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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：
2 C+ J# x: n( K5 Y1、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。0 T+ `5 i1 M. _' x
rk_get_eth_addr: rk_vendor_read eth mac address failed (-1)4 J, X( v! ?( v% Z
rk_get_eth_addr: rk_vendor_write eth mac address failed (-1): @; j2 d3 ~) I1 ~" K6 s
rk_get_eth_addr: mac address: cc:10:ad:eb:70:55
- ?6 }: H4 s' b( C1 f2 k2、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 z+ z0 W( D0 g) L
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; K% y1 y7 }3 \0 C5 r; ~
/*modified by woodrow*/8 |3 C1 N+ L3 V) P0 r
union {* i' c- v. Y) ^1 `( r% |# _
unsigned long ul;4 M* s7 S7 Q% @+ B3 U0 M( }" p
unsigned char uc[8]; }8 K6 d q9 ~# ^: q
} cc;
' R5 J5 B! n1 I; X2 l# q* G$ } //random_ether_addr(addr);' @" o& @) J1 L; q& ?' N# `- V
// dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",- p B5 L i5 S% V+ G
// __func__, addr[0], addr[1], addr[2],
' q5 L; f: v$ `4 b // addr[3], addr[4], addr[5]);' m! _; I) [ x4 s6 c
unsigned long system_low = (unsigned long)system_serial_low;
7 {- J$ {1 c0 t! e+ \% i4 q unsigned long system_high = (unsigned long)system_serial_high;" e* f+ o3 ^, `* i+ ]$ E+ N% R/ F. d
dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret); f4 C4 _' ]! Q9 p6 @4 Q
dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);, X, K' \9 m* a- @3 h5 y
cc.ul = system_low;: _) @. Q$ @% m
addr[0] = 0xcc;
! n" Y, E+ m4 i- F, O: O addr[1] = 0x10;5 A4 I7 [3 B: p0 |% }& R
addr[2] = cc.uc[3];
& G9 c) ]' F* l addr[3] = cc.uc[2];
! U' ^5 g5 b3 K& ~. l addr[4] = cc.uc[1];
. g: j+ C$ W9 P. y) a addr[5] = cc.uc[0];& t6 ]% p ?0 d# }- t) X ^/ u
/*modified by woodrow*/
" @! j( E. J* O8 z# \+ b+ 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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