Good morning. I'm testing QEMU for Aurix Tricore board. I have seen that no output is shown by QEMU when the serial port of the Tricore adapter is used.
This is strange because, for some different embedded platforms (e.g. the VersatilePB board), the emulation of the serial output is correctly supported by QEMU, as it is possible to read at the link: https://balau82.wordpress.com/2010/02/28/hello-world-for-bare-metal-arm-using-qemu/ In effect, I have built a HelloWorld binary compiled for the VersatilePB board and it is correctly loaded by qemu-system-arm.exe, which shows the string "Hello World" in the emulator of the serial console. As a consequence, I've suspected that the issue was in the source code of the QEMU emulator related to the Infineon Aurix Tricore board. I have analyzed the QEMU source code contained in the tricore_board.c file and I have found that my hypothesis was correct. The issue is that the source code of QEMU for the Tricore adapters does not support any emulation of the serial port. My project exploits the Tricore boards to work, but it needs that the software can generate an output through the (emulated) serial port. In order to solve the issue, I tried to modify the source code of the Tricore board module of QEMU in order to add a "virtual serial adapter", that should be emulated by reusing the source code exploited in the VersatilePB board for the PL011 PrimeCell UART. I have modified the code also in order to emulate a virtual interrupt controller, which should be emulated by reusing the source code exploited in the VersatilePB board for the PL190 PrimeCell interrupt controller. In the file tricore_testboard.c, I have added the following lines to the routine tricore_testboard_init(): dev = sysbus_create_varargs("pl190", 0x10140000, qdev_get_gpio_in(DEVICE(cpu), 0), NULL); for (int n = 0; n<1; n++) { pic[n] = qdev_get_gpio_in(dev, n); } dev = sysbus_create_simple("tricorepb_sic", 0x10003000, NULL); for (int n = 0; n<1; n++) { sysbus_connect_irq(SYS_BUS_DEVICE(dev), n, pic[n]); sic[n] = qdev_get_gpio_in(dev, n); } pl011_create(0xe0000000, pic[0], serial_hds[0]); Also the file target_tricore\cpu.c was modified: // Begin patch static void tricore_cpu_set_irq(void *opaque, int irq, int level) { TriCoreCPU *cpu = opaque; CPUTriCoreState *env = &cpu->env; CPUState *cs = CPU(cpu); static const int mask[] = { [TRICORE_CPU_IRQ] = CPU_INTERRUPT_HARD, [TRICORE_CPU_FIQ] = CPU_INTERRUPT_FIQ, }; switch (irq) { case TRICORE_CPU_IRQ: case TRICORE_CPU_FIQ: if (level) { cpu_interrupt(cs, mask[irq]); } else { cpu_reset_interrupt(cs, mask[irq]); } break; default: g_assert_not_reached(); } } // End patch static void tricore_cpu_initfn(Object *obj) { CPUState *cs = CPU(obj); TriCoreCPU *cpu = TRICORE_CPU(obj); CPUTriCoreState *env = &cpu->env; cs->env_ptr = env; // Begin patch qdev_init_gpio_in(DEVICE(cpu), tricore_cpu_set_irq, 1); // End patch cpu_exec_init(cs, &error_abort); if (tcg_enabled()) { tricore_tcg_init(); } } I have successfully recompiled QEMU but unfortunately, when I run the emulator, I obtain the message: Unknown device 'pl190' for default sysbus It seems that the list of peripherals that can be used by a virtual board is stated somewhere in the QEMU source code, but I was unable to find where such list is actually defined (and, therefore, I was unable to modify such list for my aims). Can someone help me ? Thanks in advance.
