qemu-e2k/target-lm32
Paolo Bonzini 0d09e41a51 hw: move headers to include/
Many of these should be cleaned up with proper qdev-/QOM-ification.
Right now there are many catch-all headers in include/hw/ARCH depending
on cpu.h, and this makes it necessary to compile these files per-target.
However, fixing this does not belong in these patches.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-04-08 18:13:10 +02:00
..
Makefile.objs target-lm32: switch to AREG0 free mode 2012-09-15 17:44:32 +00:00
README
TODO
cpu-qom.h target-lm32: Update VMStateDescription to LM32CPU 2013-03-12 10:35:55 +01:00
cpu.c target-lm32: flush tlb after clearing env 2013-03-18 19:40:34 +01:00
cpu.h target-lm32: remove dead code 2013-03-18 19:40:34 +01:00
helper.c target-lm32: fix debug memory access 2013-03-18 19:40:34 +01:00
helper.h exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
machine.c target-lm32: Update VMStateDescription to LM32CPU 2013-03-12 10:35:55 +01:00
op_helper.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
translate.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00

README

LatticeMico32 target
--------------------

General
-------
All opcodes including the JUART CSRs are supported.


JTAG UART
---------
JTAG UART is routed to a serial console device. For the current boards it
is the second one. Ie to enable it in the qemu virtual console window use
the following command line parameters:
  -serial vc -serial vc
This will make serial0 (the lm32_uart) and serial1 (the JTAG UART)
available as virtual consoles.


Programmatically terminate the emulator
----------------------------------------
Originally neither the LatticeMico32 nor its peripherals support a
mechanism to shut down the machine. Emulation aware programs can write to a
to a special register within the system control block to shut down the
virtual machine.  For more details see hw/lm32_sys.c. The lm32-evr is the
first BSP which instantiate this model. A (32 bit) write to 0xfff0000
causes a vm shutdown.


Special instructions
--------------------
The translation recognizes one special instruction to halt the cpu:
  and r0, r0, r0
On real hardware this instruction is a nop. It is not used by GCC and
should (hopefully) not be used within hand-crafted assembly.
Insert this instruction in your idle loop to reduce the cpu load on the
host.


Ignoring the MSB of the address bus
-----------------------------------
Some SoC ignores the MSB on the address bus. Thus creating a shadow memory
area. As a general rule, 0x00000000-0x7fffffff is cached, whereas
0x80000000-0xffffffff is not cached and used to access IO devices. This
behaviour can be enabled with:
  cpu_lm32_set_phys_msb_ignore(env, 1);