[Qemu-devel] [Bug 889868] [NEW] CM_CTRL always reads as 0x00000000 (arm/integratorcp)

[Steven G. Messervey]

Public bug reported:

qemu -version: QEMU PC emulator version 0.12.5, Copyright (c) 2003-2008
Fabrice Bellard

uname -a: Linux zenwalk 2.6.37.4 #1 SMP PREEMPT Fri Mar 18 18:17:50 CET
2011 i686 Intel(R) Pentium(R) Dual  CPU  T2330  @ 1.60GHz GenuineIntel
GNU/Linux

command-line: qemu-system-arm -M integratorcp -cpu arm926 -m 16 -kernel
mykernel.elf -serial stdio

steps to reproduce:
--------------8<------------------------
@ assembler
@ after trivial set up for arm
read_ccmr:
  ld r4,=0x10000000
  ld r0,[r4,#0x0C]
------------------>8--------------------

---------------8<------------------------
; in C
int main(void) {
  unsigned int volatile *ccmr,test1,test2,value;
  ccmr = (unsigned int volatile *)0x1000000C;
  test1 = (*ccmr);  // reads as zero
  (printk, printf,etc....)
  value = 0x00000001; // set GREEN LED
  (*ccmr) = value;  // should set bit 0 in CM_CTL
  test2 = (*ccmr); // should return 1!
  if (test1 == test2) { 
    // printk.printf,etc
    // if test2 == 1, this code 
    // is not reached
  }
}
------------------------------>8-----------------

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: arm

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https://bugs.launchpad.net/bugs/889868

Title:
  CM_CTRL always reads as 0x00000000 (arm/integratorcp)

Status in QEMU:
  New

Bug description:
  qemu -version: QEMU PC emulator version 0.12.5, Copyright (c)
  2003-2008 Fabrice Bellard

  uname -a: Linux zenwalk 2.6.37.4 #1 SMP PREEMPT Fri Mar 18 18:17:50
  CET 2011 i686 Intel(R) Pentium(R) Dual  CPU  T2330  @ 1.60GHz
  GenuineIntel GNU/Linux

  command-line: qemu-system-arm -M integratorcp -cpu arm926 -m 16
  -kernel mykernel.elf -serial stdio

  steps to reproduce:
  --------------8<------------------------
  @ assembler
  @ after trivial set up for arm
  read_ccmr:
    ld r4,=0x10000000
    ld r0,[r4,#0x0C]
  ------------------>8--------------------

  ---------------8<------------------------
  ; in C
  int main(void) {
    unsigned int volatile *ccmr,test1,test2,value;
    ccmr = (unsigned int volatile *)0x1000000C;
    test1 = (*ccmr);  // reads as zero
    (printk, printf,etc....)
    value = 0x00000001; // set GREEN LED
    (*ccmr) = value;  // should set bit 0 in CM_CTL
    test2 = (*ccmr); // should return 1!
    if (test1 == test2) { 
      // printk.printf,etc
      // if test2 == 1, this code 
      // is not reached
    }
  }
  ------------------------------>8-----------------

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