From 3f2546b2ef55b661fd8dd69682b38992225e86f6 Mon Sep 17 00:00:00 2001 From: fishsoupisgood Date: Mon, 29 Apr 2019 01:17:54 +0100 Subject: Initial import of qemu-2.4.1 --- target-lm32/README | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 target-lm32/README (limited to 'target-lm32/README') diff --git a/target-lm32/README b/target-lm32/README new file mode 100644 index 00000000..ba3508a7 --- /dev/null +++ b/target-lm32/README @@ -0,0 +1,45 @@ +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); + -- cgit v1.2.3