编译VxWorks BSP出现的MMUCR_L4_ENABLE的问题

             编译VxWorks BSP出现的MMUCR_L4_ENABLE的问题

                        作者：makethyme

在编译VxWorks的过程中，出现如下的错误：

      $ /cygdrive/c/Tornado2.2_for_arm/host/x86-win32/bin/make build

1）ccarm -M -MG -w -mapcs-32 -mbig-endian -march=armv5-ansi  -O2 -fno-builtin -fvolatile -Wall -I/h   -I.

-IC:/Tornado2.2_for_arm/target/config/all -IC:/Tornado2.2_for_arm/target/h -IC:/Tornado2.2_for_arm/target/src/config

-IC:/Tornado2.2_for_arm/target/src/drv   。。。

2）ccarm -mapcs-32 -mbig-endian -march=armv5 -ansi  -O2 -fno-builtin -fvolatile -I/h   -I. -IC:/Tornado2.2_for_arm/target/config/all

 -IC:/Tornado2.2_for_arm/target/h -IC:/Tornado2.2_for_arm/target/src/config -IC:/Tornado2.2_for_arm/target/src/drv  。。。

 -DCPU_926EJ -DARMMMU=ARMMMU_926E -DARMCACHE=ARMCACHE_926E  -P -xassembler-with-cpp -c -o romInit.o romInit.s

 

 

关于第一个问题：可以看出是cygdrive下“/”和windows下“/”下的冲突问题，根据分析，Makefile文件最终会根据：

export WIND_HOST_TYPE=x86-win32

export SEQ_HOST=windows32

包含c:/Tornado2.2_for_arm/target/h/make/ defs.x86-win32，将其中的“/”改为“/”，例如

   BIN_DIR = $(WIND_BASE)/host/$(WIND_HOST_TYPE)/bin

改为

   BIN_DIR = $(WIND_BASE)/host/$(WIND_HOST_TYPE)/bin

 

关于第二个问题，经过查找，分析，最后发现在装Tornado for arm时，居然漏掉(也可能时安装的版本较老的缘故) target/h/arch/arm下的cacheArm926eLib.h。从别人处拷贝来该文件。

另外，分析后发现target/h/arch/arm/下的文件mmuArmLib.h不完整，经过比较发现，有如下区别

7a8

> 01r,11may04,dmh  add ARM926EJ, remove bits from variants configured incorrectly

271c272,273

< #if ((ARMMMU == ARMMMU_740T) || (ARMMMU == ARMMMU_940T) || (ARMMMU == ARMMMU_946E))

---

> #if ((ARMMMU == ARMMMU_740T) || (ARMMMU == ARMMMU_926E) || /

>      (ARMMMU == ARMMMU_940T) || (ARMMMU == ARMMMU_946E))

335a338,343

> #if ((defined CPU_926EJ) || (defined CPU_926EJ_T))

> #define MMUCR_ALTVECT      (1<<13) /* alternate vector select */

> #define MMUCR_ROUND_ROBIN    (1<<14) /* round-robin placement */

> #define MMUCR_L4_ENABLE      (1<<15) /* L4 enable, ARMv4 behavior */

> #endif /* CPU_926EJ */

> 

472,475c480

< /* W bit is Should Be One */

< 

< #define MMU_INIT_VALUE (MMUCR_PROG32 | MMUCR_DATA32 | MMUCR_L_ENABLE | /

<                       MMUCR_W_ENABLE)

---

> #define MMU_INIT_VALUE (MMUCR_PROG32 | MMUCR_DATA32 | MMUCR_L_ENABLE)

503,507c508

< /*

<  * W bit is Should Be One, select ARMv4 behaviour for LDR to PC, ITCM and DTCM

<  * are also SBO.

<  */

< 

---

> /* W bit is Should Be One */

509,510c510

<                         MMUCR_ROM | MMUCR_W_ENABLE | MMUCR_L4_ENABLE | /

<                         MMUCR_DTCM_ENABLE | MMUCR_ITCM_ENABLE)

---

>                         MMUCR_ROM)

549d548

< /* W bit is Should Be One, select ARMv4 behaviour for LDR to PC */

551,552c550

<                         MMUCR_W_ENABLE | MMUCR_BIGEND | MMUCR_ROM | /

<                         MMUCR_L4_ENABLE)

---

>                         MMUCR_BIGEND | MMUCR_ROM)

经过改正，最后能够编译完成了。