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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