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+id = 740
+title = "on single core Raspberry Pi, qemu-system-sparc appears to hang in bios"
+state = "closed"
+created_at = "2021-11-21T00:24:19.098Z"
+closed_at = "2022-03-16T03:45:48.340Z"
+labels = ["accel: TCG", "target: sparc", "workflow::Needs Info"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/740"
+host-os = "Raspbian bookworm"
+host-arch = "Raspberry Pi Model 1 B (may happen on Pi Zero too)"
+qemu-version = "version 6.1.0 (Debian 1:6.1+dfsg-8+b1)"
+guest-os = "Sparc bios ss5.bin  (download URL further down)"
+guest-arch = "SparcStation 5"
+description = """I suspect it to be a race condition related to running on the slow single core Raspberry Pi, as I haven't managed to reproduce on x86 even when using taskset to tie qemu to a single core.
+
+The problem occurs about 4 out of 5 runs on qemu 5.2 (raspbian bullseye) and so far 100% of the time on qemu 6.1.
+
+About five seconds after start the sparc bios gets as far as `ttya initialized` and then appears to hang indefinitely.
+
+Instead, it should continue after about 3 more seconds with:
+```
+Probing Memory Bank #0 32 Megabytes
+Probing Memory Bank #1 Nothing there
+Probing Memory Bank #2 Nothing there
+Probing Memory Bank #3 Nothing there
+```
+
+See below for workaround."""
+reproduce = """1. Need a single core Raspberry Pi running raspbian, such as Raspberry Pi 1 or Zero
+2. Download ss5.bin from https://github.com/andarazoroflove/sparc/raw/master/ss5.bin
+3. Run the command:
+```
+qemu-system-sparc -m 32 -bios ss5.bin -nographic
+```
+After about 5 seconds of output it hangs at `ttya initialized`"""
+additional = """##"""