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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：
, N2 E( T7 E6 Q4 P. K) K1、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。) i/ @* V# i7 ]' B
rk_get_eth_addr: rk_vendor_read eth mac address failed (-1)
, V$ a! |! d2 h+ K( s, V) I- lrk_get_eth_addr: rk_vendor_write eth mac address failed (-1)
) ], ~2 ]1 p# k3 O& T* X3 ]3 j- \, w2 drk_get_eth_addr: mac address: cc:10:ad:eb:70:556 L" J4 f& ~& n4 d9 b) e _
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, V1 J3 v" Z5 k4 e) a* w
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：
; B f% t- `1 a/*modified by woodrow*/
- [6 G% ^2 m1 K* m union {0 l: X" ]% M) \# J
unsigned long ul;
" Z: |9 E0 X9 c' N4 Q, K: f unsigned char uc[8];
' h, D9 a4 N1 g } cc;! Q, p: P" L, f k- R h8 u
//random_ether_addr(addr);
/ t% b7 |& R5 ~. n. A8 y // dev_err(dev, "%s: generate random eth mac address: %02x:%02x:%02x:%02x:%02x:%02x",) q8 v, y* ?/ G3 W
// __func__, addr[0], addr[1], addr[2]," z. m$ q8 W6 g
// addr[3], addr[4], addr[5]);, o, f, T9 D( Z8 [1 y D
unsigned long system_low = (unsigned long)system_serial_low;
5 Q# e" t% N6 M- g* T4 B8 Q unsigned long system_high = (unsigned long)system_serial_high;
9 B9 R* ]5 s9 ?8 W- }! r dev_err(dev, "%s: rk_vendor_read eth mac address failed (%d)", __func__, ret);+ e! M" G& B' ~* o
dev_err(dev, "%s: system_serial_low (%lu), system_serial_high (%lu).\n", __func__, system_low, system_high);
% Q! c% o, @7 p( |; y+ L cc.ul = system_low;
! Q8 i7 L5 w" Z4 ^$ v g addr[0] = 0xcc;+ c8 M1 T$ [/ H% Q: j0 U
addr[1] = 0x10;4 c9 s# I: `# t+ B a
addr[2] = cc.uc[3];* ?9 k( Q9 b1 w/ W
addr[3] = cc.uc[2];9 q0 F0 q. h* S- z
addr[4] = cc.uc[1];
; C1 s7 s! @* P" K8 m8 r/ e addr[5] = cc.uc[0];
0 ?1 {9 Q' P7 b, M9 U1 J/*modified by woodrow*/
; K6 x. K8 A; ]! E1 |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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