On Thu, Nov 13, 2014 at 12:23 AM, Liviu Ionescu <i...@livius.net> wrote: > > On 12 Nov 2014, at 15:51, Peter Maydell <peter.mayd...@linaro.org> wrote: > >> ... I'd suggest looking at Alistair's patches >> on the list for supporting the netduino2,
I figure I will fill you in on what I am trying to do, in case it is any help. I am trying to model the Netduino Plus 2 (STM32F4xx - Cortex-M4) board in QEMU. I didn't want to spend time on implementing the Cortex-M4 CPU as for my use case I don't need it, so out of tree I have the Netduino Plus 2 with a Cortex-M3. I am trying to get as much of my work upstreamed to mainline by using the Netduino 2 board (STM32F2xx - Cortex-M3). There are a few submissions on list and hopefully after the release of 2.2 it will be accepted. All of my work can be seen at: https://github.com/alistair23/qemu. Some of it is specific for my use case (it is aimed as a learning tool for a University class) so if you need any help understanding what I did just ask and I am happy to help. Support for the Cortex-M4 would be great so I will help where I can. Thanks, Alistair > > will certainly do. > > and I also plan to review the patches of Andre Bechus, available from > https://github.com/beckus/qemu_stm32. > >>> for me, the plain arm-softmmu is not usable, since it forwards the >>> semihosting calls via gdb instead of using native implementation, >>> so I had to add a configuration variable to change this behaviour. >> >> That sounds like the kind of thing that other people might also >> want to be able to do, so it would be better to make arm-softmmu >> be runtime configurable on this, I think. > > for the gnuarmeclipse-qemu target, since I never need to forward semihosting > to gdb, the solution was to add a configuration variable and statically set > it at build time to always use native calls. > > --- gdbstub.c --- > /* If gdb is connected when the first semihosting syscall occurs then use > remote gdb syscalls. Otherwise use native file IO. */ > int use_gdb_syscalls(void) > { > #if !defined(CONFIG_SEMIHOSTING_NATIVE) > if (gdb_syscall_mode == GDB_SYS_UNKNOWN) { > gdb_syscall_mode = (gdbserver_state ? GDB_SYS_ENABLED > : GDB_SYS_DISABLED); > } > return gdb_syscall_mode == GDB_SYS_ENABLED; > #else > // Make semihosting always use native file IO. > if (gdb_syscall_mode == GDB_SYS_UNKNOWN) { > gdb_syscall_mode = GDB_SYS_DISABLED; > } > return FALSE; > #endif > } > > for arm-softmmu you probably need a way to configure this at run-time, which > would involve a new monitor command, that can be issued from the GDB client > via 'mon XXXX'. > > I guess you are not happy with a new gnuarmeclipse-qemu target, but since my > experience with arm-softmmu is almost null, I want to avoid breaking anything > there. > > > regards, > > Liviu > > >
