QEMU ARM · browser runner + host command builder

Quick presets native command

Start from a command

Choose a preset to fill the native QEMU command fields below. You can edit every value afterwards.

Machine

Filter

CPU RAM (MiB) blank = machine defaultLeave blank to use the board memory map.

Programs & images

Drop files here or click to choose
ELF · bin · hex · kernel · dtb · initrd · SD image · firmware

Dropped files are loaded into the browser runner. The native command uses the host path entered in the Native QEMU command section.

Kernel command line -append

Browser display & terminal

Screen Screen backend

Terminal input goes to the selected UART or semihosting console. SDL keyboard/pointer events are separate and require matching input hardware on the selected board.

Snapshot interval

Terminal

Size Backspace sends

Treat bare LF as CR+LF (bare-metal printf) Local echo (firmware that doesn't echo) Extra serial ports shown read-only in UART logs

Native QEMU command

For your computer's QEMU. The command at the bottom is meant for a native qemu-system-arm installed on your host. The page's Start button still runs the WebAssembly build; GTK is normally not available in that browser build.

Display argument -display Serial 0 -serial Monitor -monitor Parallel -parallel Chardev definition -chardev Semihosting mode

Target Chardev ID

Kernel path on host -kernel Log guest errors (-d guest_errors,unimp) Extra QEMU arguments

Browser runner options

Semihosting (browser runner: -semihosting)

These controls affect the in-browser WebAssembly run. Native command options are above.

Screen

No screen for this machine

Terminalserial 0 · click, then type

stderr from QEMU itself, plus probe results

ScreenSave PNGFull screen

Terminalserial 0 · click, then typeClearSave text

Screen

Terminalserial 0 · click, then type