If I disable TSC in SeaBIOS (i.e. CONFIG_TSC_TIMER=n) the floppy can't be booted with or without TSC-capable CPU. So, it can't be fixed on QEMU side.
If I disable TSC in SeaBIOS (i.e. CONFIG_TSC_TIMER=n) the floppy can't be booted with or without TSC-capable CPU. So, it can't be fixed on QEMU side.