@node Xtensa System emulator
@section Xtensa System emulator

Two executables cover simulation of both Xtensa endian options,
@file{qemu-system-xtensa} and @file{qemu-system-xtensaeb}.
Two different machine types are emulated:

@itemize @minus
@item
Xtensa emulator pseudo board "sim"
@item
Avnet LX60/LX110/LX200 board
@end itemize

The sim pseudo board emulation provides an environment similar
to one provided by the proprietary Tensilica ISS.
It supports:

@itemize @minus
@item
A range of Xtensa CPUs, default is the DC232B
@item
Console and filesystem access via semihosting calls
@end itemize

The Avnet LX60/LX110/LX200 emulation supports:

@itemize @minus
@item
A range of Xtensa CPUs, default is the DC232B
@item
16550 UART
@item
OpenCores 10/100 Mbps Ethernet MAC
@end itemize

@c man begin OPTIONS

The following options are specific to the Xtensa emulation:

@table @option

@item -semihosting
Enable semihosting syscall emulation.

Xtensa semihosting provides basic file IO calls, such as open/read/write/seek/select.
Tensilica baremetal libc for ISS and linux platform "sim" use this interface.

Note that this allows guest direct access to the host filesystem,
so should only be used with trusted guest OS.

@end table

@c man end