Hi,
I've been doing some bare metal programming using the powerpc system emulator.
I was able to run some of my code using the g3beige system emulation. I am now
currently trying emulate some external registers. Simply a powerpc address will
be mapped to a register. My plan is to write a bare metal C program that will
access the contents of a given powerpc address via pointers.
My current approach is to create a new MemoryRegion in the init function of the
g3beige source code (mac_oldworld.c). My idea is to set up some mmio to certain
address to represent those registers. For now I only care about reading and
writing, but in the future I hope to add additional logic when the registers
are written.
I added the following lines:
MemoryRegion *reg = g_new(MemoryRegion, 1);
memory_region_init_alias(reg, NULL, "reg_mmio",
get_system_io(), 0, 0x00200000);
memory_region_add_subregion(sysmem, 0xfc000000, reg);
In my bare metal program I used the following lines to see if it works using
GDB. The issue is that GDB hangs when the pointer is either read or written.
This makes me think I am doing something incorrectly.
volatile unsigned int * const test = (unsigned int *) 0xFC000000;
*test = 5640;
//read from register to confirm
if (5640 == *test) //seems to pause as well...
{
breakpoint_hit();
}
I have very little limited experience with emulators so I thought I would ask
to see if anyone has tips or suggestions.
Thanks!
