I'm experiencing some issues with the startup code for an emulated Cortex-a15 machine I plan to use for running unit-tests.
I'm starting QEMU with: .../qemu-system-arm "--machine" "virt" "--cpu" "cortex-a15" "--nographic" "-d" "unimp,guest_errors" "--semihosting-config" "enable=on,target=native,arg=sample-test,arg=one,arg=two" -s -S At 0x0 I'm loading the application that uses the newlib semihosting library and startup. The application starts and I can use GDB to step into the code from the very beginning. In crt0 the first thing I see is a call to SYS_HEAPINFO, followed by setting the heap and stack. The values returned are: 0x04000000 - heap base 0x08000000 - heap limit 0x08000000 - stack base 0x0 - stack limit This sets the SP at 0x08000000, which I'm not sure it is a valid memory address, since writes to it seem ineffective, and in the first function called, when it tries to pop registers from the stack, everything is zero, and the program jumps to 0x0. I'm not very familiar with the Cortex-A15 memory map and initialisation; if the memory below 0x08000000 is indeed valid for a stack, probably I need to enable something more during the reset sequence, to make it writable. Any suggestion? Liviu
