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authorThomas Huth <thuth@redhat.com>2016-10-11 08:56:52 +0200
committerThomas Huth <thuth@redhat.com>2016-12-20 21:52:12 +0100
commitfcf5ef2ab52c621a4617ebbef36bf43b4003f4c0 (patch)
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parent82ecffa8c050bf5bbc13329e9b65eac1caa5b55c (diff)
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Move target-* CPU file into a target/ folder
We've currently got 18 architectures in QEMU, and thus 18 target-xxx folders in the root folder of the QEMU source tree. More architectures (e.g. RISC-V, AVR) are likely to be included soon, too, so the main folder of the QEMU sources slowly gets quite overcrowded with the target-xxx folders. To disburden the main folder a little bit, let's move the target-xxx folders into a dedicated target/ folder, so that target-xxx/ simply becomes target/xxx/ instead. Acked-by: Laurent Vivier <laurent@vivier.eu> [m68k part] Acked-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> [tricore part] Acked-by: Michael Walle <michael@walle.cc> [lm32 part] Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> [s390x part] Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> [s390x part] Acked-by: Eduardo Habkost <ehabkost@redhat.com> [i386 part] Acked-by: Artyom Tarasenko <atar4qemu@gmail.com> [sparc part] Acked-by: Richard Henderson <rth@twiddle.net> [alpha part] Acked-by: Max Filippov <jcmvbkbc@gmail.com> [xtensa part] Reviewed-by: David Gibson <david@gibson.dropbear.id.au> [ppc part] Acked-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> [cris&microblaze part] Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> [unicore32 part] Signed-off-by: Thomas Huth <thuth@redhat.com>
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diff --git a/target-lm32/README b/target-lm32/README
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-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.
-
-
-Semihosting
------------
-Semihosting on this target is supported. Some system calls like read, write
-and exit are executed on the host if semihosting is enabled. See
-target/lm32-semi.c for all supported system calls. Emulation aware programs
-can use this mechanism to shut down the virtual machine and print to the
-host console. See the tcg tests for an example.
-
-
-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);
-