I tried running my raspberrypi BSP image that worked on the Pi Zero and W, but it did not work on the Pi 3.
I built the raspberrypi2 BSP, used objcopy to copy the binary to my sd card as kernel7.img, and it works on my Pi 3 and Pi3 A+ ( without ethernet) . Note that my config.txt file does not specify the kernel image, so the firmware defaults to kernel.img for the single core models and kernel7.img for the 2 and 3. I probably wont get a chance to try u-boot until later today or tomorrow. But these patches are great for enabling the Pi Zero W and Pi 3 models! Thanks, Alan On Sun, Feb 16, 2020 at 10:58 AM G. S. Niteesh <gsnb...@gmail.com> wrote: > > On Sun, Feb 16, 2020 at 8:37 PM Alan Cudmore <alan.cudm...@gmail.com> wrote: >> >> Hi Niteesh, >> I can try this patch on my Pi 3. Which BSP should I use? Is there any >> special setup or BSP configuration needed? >> Thanks, >> Alan > > Hi Alan, > First of all, thank you for taking this initiative. > I have tried using the default bootloader in Pi3 to load RTEMS but it doesn't > work, > Can you try it? > The currently use U-Boot in 32bit mode as the bootloader. > You can use the below instructions to build U-Boot in 32bit mode > > git clone https://github.com/u-boot/u-boot.git u-boot > cd u-boot > git revert 995eab8b5b580b67394312b1621c60a71042cd18 > make CROSS_COMPILE=arm-linux-gnueabi- rpi_3_32b_defconfig > make CROSS_COMPILE=arm-linux-gnueabi- > > This one uses an old version of U-Boot and I don't know if there is > a new way to build in 32bit mode. > > To build the U-Boot image of RTEMS you can use the below instructions > > arm-rtems5-objcopy -Obinary hello.exe kernel.img > mkimage -A arm -O linux -T kernel -a 0x200000 -e 0x200080 -d kernel.img -C > none rtems.img > > To load and run in U-Boot > > fatload mmc 0 0x200000 rtems.img > fatload mmc 0 0x1000 bcm2710-rpi-3-b.dtb > bootm 0x200000 - 0x1000 > > And to make your U-Boot build process simpler I have uploaded my u-boot.bin > to my github, please use it :) > https://github.com/gs-niteesh/rpi3_RTEMS > > And sorry for the delay, I tested all these instructions again before sending > them. > > Thanks > Niteesh. > > On Sun, Feb 16, 2020 at 2:35 AM G. S. Niteesh <gsnb...@gmail.com> wrote: >> >> > >> > Hii, >> > This is a reminder message since this patch has been unnoticed for a while. >> > I have tested it on Raspberry Pi 3 and it works fine. There is also >> > another patch >> > https://lists.rtems.org/pipermail/devel/2020-February/057194.html, please >> > do have a look at these. >> > >> > Thank you. >> > Niteesh >> > On Mon, Feb 10, 2020 at 12:52 AM G S Niteesh <gsnb...@gmail.com> wrote: >> >> >> >> This patch adds driver for Mini UART present in Raspberry Pi 3 >> >> and above, this UART is currently used as the primary UART in >> >> these models. >> >> The Mini UART is similar to ns16550, this driver is built >> >> upon libchip/ns16550. >> >> --- >> >> bsps/arm/raspberrypi/console/console-config.c | 118 ++++++++++++++++-- >> >> bsps/arm/raspberrypi/include/bsp/usart.h | 1 + >> >> 2 files changed, 110 insertions(+), 9 deletions(-) >> >> >> >> diff --git a/bsps/arm/raspberrypi/console/console-config.c >> >> b/bsps/arm/raspberrypi/console/console-config.c >> >> index 48c4c6a3ec..62196786dd 100644 >> >> --- a/bsps/arm/raspberrypi/console/console-config.c >> >> +++ b/bsps/arm/raspberrypi/console/console-config.c >> >> @@ -24,6 +24,7 @@ >> >> >> >> #include <libchip/serial.h> >> >> #include <libfdt.h> >> >> +#include <libchip/ns16550.h> >> >> >> >> #include <bspopts.h> >> >> #include <bsp/usart.h> >> >> @@ -34,35 +35,103 @@ >> >> #include <bsp/console-termios.h> >> >> #include <bsp/fdt.h> >> >> #include <bsp/fatal.h> >> >> +#include <bsp/gpio.h> >> >> +#include <bsp/rpi-gpio.h> >> >> >> >> - >> >> -#define UART0 "/dev/ttyS0" >> >> +/** >> >> + * UART0 - PL011 >> >> + * UART1 - Mini UART >> >> + */ >> >> +#define PL011 "/dev/ttyAMA0" >> >> +#define MINIUART "/dev/ttyS0" >> >> #define FBCONS "/dev/fbcons" >> >> >> >> arm_pl011_context pl011_context; >> >> +ns16550_context mini_uart_context; >> >> >> >> rpi_fb_context fb_context; >> >> >> >> -static void output_char_serial(char c) >> >> +static void output_char_pl011(char c) >> >> { >> >> arm_pl011_write_polled(&pl011_context.base, c); >> >> } >> >> >> >> +static void output_char_mini_uart(char c) >> >> +{ >> >> + ns16550_polled_putchar(&mini_uart_context.base, c); >> >> +} >> >> + >> >> void output_char_fb(char c) >> >> { >> >> fbcons_write_polled(&fb_context.base, c); >> >> } >> >> >> >> +static uint8_t mini_uart_get_reg(uintptr_t port, uint8_t index) >> >> +{ >> >> + volatile uint32_t *val = (volatile uint32_t *)port + index; >> >> + return (uint8_t) *val; >> >> +} >> >> + >> >> +static void mini_uart_set_reg(uintptr_t port, uint8_t index, uint8_t val) >> >> +{ >> >> + volatile uint32_t *reg = (volatile uint32_t *)port + index; >> >> + *reg = val; >> >> +} >> >> + >> >> static void init_ctx_arm_pl011( >> >> const void *fdt, >> >> int node >> >> ) >> >> { >> >> arm_pl011_context *ctx = &pl011_context; >> >> - rtems_termios_device_context_initialize(&ctx->base, "UART"); >> >> + rtems_termios_device_context_initialize(&ctx->base, "PL011UART"); >> >> ctx->regs = raspberrypi_get_reg_of_node(fdt, node); >> >> } >> >> >> >> +static uint32_t calculate_baud_divisor( >> >> + ns16550_context *ctx, >> >> + uint32_t baud >> >> +) >> >> +{ >> >> + uint32_t baudDivisor = (ctx->clock / (8 * baud)) - 1; >> >> + return baudDivisor; >> >> +} >> >> + >> >> +static void init_ctx_mini_uart( >> >> + const void *fdt, >> >> + int node >> >> +) >> >> +{ >> >> + const char *status; >> >> + int len; >> >> + ns16550_context *ctx; >> >> + >> >> + memset(&mini_uart_context, 0, sizeof(mini_uart_context)); >> >> + ctx = &mini_uart_context; >> >> + >> >> + rtems_termios_device_context_initialize(&ctx->base, "MiniUART"); >> >> + >> >> + status = fdt_getprop(fdt, node, "status", &len); >> >> + if ( status == NULL || strcmp(status, "disabled" ) == 0){ >> >> + return ; >> >> + } >> >> + >> >> + ctx->port = (uintptr_t) raspberrypi_get_reg_of_node(fdt, node); >> >> + ctx->initial_baud = MINI_UART_DEFAULT_BAUD; >> >> + ctx->clock = BCM2835_CLOCK_FREQ; >> >> + ctx->calculate_baud_divisor = calculate_baud_divisor; >> >> + ctx->get_reg = mini_uart_get_reg; >> >> + ctx->set_reg = mini_uart_set_reg; >> >> + >> >> + rtems_gpio_bsp_select_specific_io(0, 14, RPI_ALT_FUNC_5, NULL); >> >> + rtems_gpio_bsp_select_specific_io(0, 15, RPI_ALT_FUNC_5, NULL); >> >> + rtems_gpio_bsp_set_resistor_mode(0, 14, NO_PULL_RESISTOR); >> >> + rtems_gpio_bsp_set_resistor_mode(0, 15, NO_PULL_RESISTOR); >> >> + >> >> + BCM2835_REG(AUX_ENABLES) |= 0x1; >> >> + ns16550_probe(&ctx->base); >> >> +} >> >> + >> >> static void register_fb( void ) >> >> { >> >> if (fbcons_probe(&fb_context.base) == true) { >> >> @@ -87,16 +156,28 @@ static void console_select( void ) >> >> link(FBCONS, CONSOLE_DEVICE_NAME); >> >> return ; >> >> } >> >> + } else if ( strncmp( opt, MINIUART, sizeof(MINIUART) - 1 ) == 0) { >> >> + BSP_output_char = output_char_mini_uart; >> >> + link(MINIUART, CONSOLE_DEVICE_NAME); >> >> + } else if ( strncmp( opt, PL011, sizeof(PL011) - 1 ) == 0) { >> >> + BSP_output_char = output_char_pl011; >> >> + link(PL011, CONSOLE_DEVICE_NAME); >> >> } >> >> + }else { >> >> + /** >> >> + * If no command line option was given, default to PL011. >> >> + */ >> >> + BSP_output_char = output_char_pl011; >> >> + link(PL011, CONSOLE_DEVICE_NAME); >> >> } >> >> - BSP_output_char = output_char_serial; >> >> - link(UART0, CONSOLE_DEVICE_NAME); >> >> } >> >> >> >> static void uart_probe(void) >> >> { >> >> static bool initialized = false; >> >> const void *fdt; >> >> + const char *console; >> >> + int len; >> >> int node; >> >> >> >> if ( initialized ) { >> >> @@ -104,17 +185,29 @@ static void uart_probe(void) >> >> } >> >> >> >> fdt = bsp_fdt_get(); >> >> - node = fdt_node_offset_by_compatible(fdt, -1, "brcm,bcm2835-pl011"); >> >> >> >> + node = fdt_node_offset_by_compatible(fdt, -1, "brcm,bcm2835-pl011"); >> >> init_ctx_arm_pl011(fdt, node); >> >> >> >> + node = fdt_node_offset_by_compatible(fdt, -1, "brcm,bcm2835-aux-uart"); >> >> + init_ctx_mini_uart(fdt, node); >> >> + >> >> + node = fdt_path_offset(fdt, "/aliases"); >> >> + console = fdt_getprop(fdt, node, "serial0", &len); >> >> + >> >> + if ( strcmp(console, "/soc/serial@7e215040" ) == 0) { >> >> + BSP_output_char = output_char_mini_uart; >> >> + }else { >> >> + BSP_output_char = output_char_pl011; >> >> + } >> >> + >> >> initialized = true; >> >> } >> >> >> >> static void output_char(char c) >> >> { >> >> uart_probe(); >> >> - output_char_serial(c); >> >> + (*BSP_output_char)(c); >> >> } >> >> >> >> rtems_status_code console_initialize( >> >> @@ -127,12 +220,19 @@ rtems_status_code console_initialize( >> >> >> >> uart_probe(); >> >> rtems_termios_device_install( >> >> - UART0, >> >> + PL011, >> >> &arm_pl011_fns, >> >> NULL, >> >> &pl011_context.base >> >> ); >> >> >> >> + rtems_termios_device_install( >> >> + MINIUART, >> >> + &ns16550_handler_polled, >> >> + NULL, >> >> + &mini_uart_context.base >> >> + ); >> >> + >> >> register_fb(); >> >> >> >> console_select(); >> >> diff --git a/bsps/arm/raspberrypi/include/bsp/usart.h >> >> b/bsps/arm/raspberrypi/include/bsp/usart.h >> >> index abbf53626c..6af1844b3c 100644 >> >> --- a/bsps/arm/raspberrypi/include/bsp/usart.h >> >> +++ b/bsps/arm/raspberrypi/include/bsp/usart.h >> >> @@ -33,6 +33,7 @@ extern "C" { >> >> #endif /* __cplusplus */ >> >> >> >> #define PL011_DEFAULT_BAUD 115000 >> >> +#define MINI_UART_DEFAULT_BAUD 115200 >> >> #define BCM2835_PL011_BASE (RPI_PERIPHERAL_BASE + 0x201000) >> >> >> >> #ifdef __cplusplus >> >> -- >> >> 2.17.1 >> >> >> > _______________________________________________ >> > devel mailing list >> > devel@rtems.org >> > http://lists.rtems.org/mailman/listinfo/devel _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
