u-boot开启硬件看门狗，问题请教

2022-12-04 14:09:08 1.5k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

AM335X外部看门狗及LINUX系统驱动移植（二）看门狗定时器（WDT，Watch Dog Timer）是嵌入式系统的的一个组成部分，它实际上是一个计数器，一般给看门狗设置复位时间间隔，程序开始运行后看门狗开始计数。如果程序运行正常，过一段时间CPU应发出指令让看门狗置零，重新开始计数。如果看门狗增加到设定值就认为程序没有正常工作，强制整个系统复位。所以，当开启看门狗后，需要在看门狗超时（计数减到0）前，对其进行喂狗（复位）操作，否则看门狗会发出复位信号，当CPU接收到该信号将复位系统。以TPL5010为例，介绍在AM335x平台上的使用，主要内容阅读详情

最近在修改https://github.com/MarvellEmbeddedProcessors/u-boot-marvell 这个u-boot，在include/configs/msys.h中打开宏#define CONFIG_HW_WATCHDOG

在编译过程中，有两个函数crc32.c,time.c出错

sw@ubuntu:~/Work/u-boot-2013.01$ ./build.pl -b ac3_db -f spi -v 2016_T1.0.eng_drop_v6-1500 -i nand:spi -c -o /home/sw/Work/out/u-boot-2013.01

**** [Cleaning Make] *****

Configuring for ac3_db - Board: msys, Options: DB_AC3,ALLEYCAT3

**** [Setting Macros] *****

Boot from SPI
** Little ENDIAN **
Support flash: NAND SPI

*** DDR3LIB = v2 *********************************

** DDRTYPE = DDR3 **

**** [Building U-BOOT] *****

CC base64.c
CC arc4.c
CC bignum.c
CC aes.c
CC certs.c
CC debug.c
CC des.c
CC dhm.c
CC havege.c
CC md2.c
CC md4.c
CC md5.c
CC net.c
CC padlock.c
CC rsa.c
CC sha1.c
CC sha2.c
CC sha4.c
CC ssl_cli.c
CC ssl_srv.c
CC ssl_tls.c
CC x509parse.c
CC timing.c
CC xtea.c
CC camellia.c
CC mvMemPool.c
AR libpolarssl.a
ar: creating libpolarssl.a
RL libpolarssl.a
CC aes/aescrypt2.c
CC hash/md5sum.c
CC hash/hello.c
CC hash/sha1sum.c
CC pkey/dh_client.c
CC hash/sha2sum.c
CC pkey/dh_genprime.c
CC pkey/dh_server.c
CC pkey/mpi_demo.c
CC pkey/rsa_genkey.c
CC pkey/rsa_sign.c
CC pkey/rsa_verify.c
pkey/rsa_sign.c: In function ‘main’:
pkey/rsa_sign.c:104:17: warning: implicit declaration of function ‘sha4_file’ [-Wimplicit-function-declaration]
if( ( ret = sha4_file( argv[1], hash, 0 ) ) != 0 )
^
CC ssl/ssl_client1.c
CC ssl/ssl_server.c
CC ssl/ssl_client2.c
pkey/rsa_verify.c: In function ‘main’:
pkey/rsa_verify.c:129:17: warning: implicit declaration of function ‘sha4_file’ [-Wimplicit-function-declaration]
if( ( ret = sha4_file( argv[1], hash, 0 ) ) != 0 )
^
CC test/benchmark.c
CC test/selftest.c
CC test/ssl_test.c
test/selftest.c: In function ‘main’:
test/selftest.c:143:17: warning: implicit declaration of function ‘camellia_self_test’ [-Wimplicit-function-declaration]
if( ( ret = camellia_self_test( v ) ) != 0 )
^
Building linker script for board msys, Non-secure mode
Building linker script for board msys, Secure mode
a - uboot_drv.o
a - uboot_skb.o
a - sky2.o
a - skge.o
a - sky2le.o
a - skdim.o
a - skaddr.o
a - skgehwt.o
a - skgeinit.o
a - skgesirq.o
a - sktwsi.o
a - sklm80.o
a - skqueue.o
a - skrlmt.o
a - sktimer.o
a - skvpd.o
a - skxmac2.o
a - skcsum.o
crc32.o: In function `crc32_wd':
/home/sw/Work/u-boot-2013.01/lib/crc32.c:244: undefined reference to `hw_watchdog_reset'
time.o: In function `udelay':
/home/sw/Work/u-boot-2013.01/lib/time.c:37: undefined reference to `hw_watchdog_reset'
Makefile:74: recipe for target 'demo' failed
make[1]: *** [demo] Error 1
make[1]: *** Waiting for unfinished jobs....
crc32.o: In function `crc32_wd':
/home/sw/Work/u-boot-2013.01/lib/crc32.c:244: undefined reference to `hw_watchdog_reset'
time.o: In function `udelay':
/home/sw/Work/u-boot-2013.01/lib/time.c:37: undefined reference to `hw_watchdog_reset'
Makefile:70: recipe for target 'monext' failed
make[2]: *** [monext] Error 1
Makefile:87: recipe for target 'marvell/monext.bin' failed
make[1]: *** [marvell/monext.bin] Error 2
Makefile:605: recipe for target 'examples/api' failed
make: *** [examples/api] Error 2