diff options
| -rw-r--r-- | Documentation/boards/bcm2835.rst | 8 | ||||
| -rw-r--r-- | arch/arm/boards/raspberry-pi/lowlevel.c | 87 | ||||
| -rw-r--r-- | arch/arm/mach-bcm283x/include/mach/debug_ll.h | 6 | ||||
| -rw-r--r-- | images/Makefile.bcm283x | 4 |
4 files changed, 99 insertions, 6 deletions
diff --git a/Documentation/boards/bcm2835.rst b/Documentation/boards/bcm2835.rst index 0b5299a340..a8eed9aec0 100644 --- a/Documentation/boards/bcm2835.rst +++ b/Documentation/boards/bcm2835.rst @@ -15,14 +15,14 @@ Raspberry Pi - ``images/barebox-raspberry-pi-2.img`` for the BCM2836/CORTEX-A7 (Raspberry Pi 2) - ``images/barebox-raspberry-pi-3.img`` for the BCM2837/CORTEX-A53 (Raspberry Pi 3) - ``images/barebox-raspberry-pi-cm3.img`` for the BCM2837/CORTEX-A53 (Raspberry Pi CM3) + - ``images/barebox-raspberry-pi.img``, which is a super set of all the other images Copy the respective image for your model to your SD card and name it ``barebox.img``. - Alternatively, ``images/barebox-dt-2nd.img`` can be used as single bootloader for all - supported 32-bit boards. In this case the device tree supplied by the video core - is directly used by barebox to probe. The device trees in ``arch/arm/dts/*.dtb`` - will need to be renamed for alignment with the naming scheme expected by the videocore. + The ``images/barebox-raspberry-pi.img`` is expected to replace the other images + in the future. It contains the device trees of all supported (and enabled) variants + and determines at runtime what board it runs on and does the right thing. 4. Create a text file ``config.txt`` on the SD card with the following content:: diff --git a/arch/arm/boards/raspberry-pi/lowlevel.c b/arch/arm/boards/raspberry-pi/lowlevel.c index 091bfb8f4b..82b51b5b15 100644 --- a/arch/arm/boards/raspberry-pi/lowlevel.c +++ b/arch/arm/boards/raspberry-pi/lowlevel.c @@ -4,7 +4,10 @@ #include <asm/cache.h> #include <common.h> #include <linux/sizes.h> +#include <asm/unaligned.h> #include <mach/platform.h> +#include <debug_ll.h> +#include <mach/mbox.h> #include <of.h> #include "lowlevel.h" @@ -45,8 +48,6 @@ static inline void start_raspberry_pi(unsigned long memsize, void *fdt, { unsigned long endmem = rpi_stack_top(memsize); - arm_cpu_lowlevel_init(); - copy_vc_fdt((void *)endmem, vc_fdt, VIDEOCORE_FDT_SZ); fdt += get_runtime_offset(); @@ -64,20 +65,102 @@ extern char __dtb_z_bcm2837_rpi_cm3_start[]; RPI_ENTRY_FUNCTION(start_raspberry_pi1, SZ_128M, r2) { + arm_cpu_lowlevel_init(); + start_raspberry_pi(SZ_128M, __dtb_z_bcm2835_rpi_start, (void *)r2); } RPI_ENTRY_FUNCTION(start_raspberry_pi2, SZ_512M, r2) { + arm_cpu_lowlevel_init(); + start_raspberry_pi(SZ_512M, __dtb_z_bcm2836_rpi_2_start, (void *)r2); } RPI_ENTRY_FUNCTION(start_raspberry_pi3, SZ_512M, r2) { + arm_cpu_lowlevel_init(); + start_raspberry_pi(SZ_512M, __dtb_z_bcm2837_rpi_3_start, (void *)r2); } RPI_ENTRY_FUNCTION(start_raspberry_pi_cm3, SZ_512M, r2) { + arm_cpu_lowlevel_init(); + start_raspberry_pi(SZ_512M, __dtb_z_bcm2837_rpi_cm3_start, (void *)r2); } + +#define DT_IF_ENABLED(dt, cfg) \ + (IS_ENABLED(cfg) ? (dt) : NULL) + +static void *rpi_get_board_fdt(int rev) +{ + if (!(rev & 0x800000)) + return DT_IF_ENABLED(__dtb_z_bcm2835_rpi_start, CONFIG_MACH_RPI); + + switch (((rev >> 4) & 0xff)) { + case BCM2835_BOARD_REV_A: + case BCM2835_BOARD_REV_B: + case BCM2835_BOARD_REV_A_PLUS: + case BCM2835_BOARD_REV_B_PLUS: + case BCM2835_BOARD_REV_CM1: + case BCM2835_BOARD_REV_ZERO: + case BCM2835_BOARD_REV_ZERO_W: + return DT_IF_ENABLED(__dtb_z_bcm2835_rpi_start, CONFIG_MACH_RPI); + + case BCM2836_BOARD_REV_2_B: + return DT_IF_ENABLED(__dtb_z_bcm2836_rpi_2_start, CONFIG_MACH_RPI2); + + case BCM2837_BOARD_REV_3_B: + case BCM2837B0_BOARD_REV_3B_PLUS: + case BCM2837B0_BOARD_REV_3A_PLUS: + case BCM2837B0_BOARD_REV_ZERO_2: + return DT_IF_ENABLED(__dtb_z_bcm2837_rpi_3_start, CONFIG_MACH_RPI3); + + case BCM2837_BOARD_REV_CM3: + case BCM2837B0_BOARD_REV_CM3_PLUS: + return DT_IF_ENABLED(__dtb_z_bcm2837_rpi_cm3_start, CONFIG_MACH_RPI_CM3); + } + + return NULL; +} + +RPI_ENTRY_FUNCTION(start_raspberry_pi_generic, SZ_128M, vc_fdt) +{ + void *fdt = NULL; + ssize_t memsize; + int rev; + + arm_cpu_lowlevel_init(); + + debug_ll_init(); + + putc_ll('>'); + + relocate_to_current_adr(); + setup_c(); + + memsize = rpi_get_arm_mem(); + if (memsize < 0) { + pr_warn("mbox: failed to query ARM memory size. 128M assumed.\n"); + memsize = SZ_128M; + } + + rev = rpi_get_board_rev(); + if (rev >= 0) { + pr_debug("Detected revision %08x\n", rev); + fdt = rpi_get_board_fdt(rev); + } + + if (!fdt) { + fdt = (void *)vc_fdt; + + pr_warn("Unknown Rpi board with rev %08x.\n", rev); + + if (get_unaligned_be32(fdt) != 0xd00dfeed) + panic("No suitable built-in or videocore-supplied DT\n"); + } + + start_raspberry_pi(memsize, fdt, (void *)vc_fdt); +} diff --git a/arch/arm/mach-bcm283x/include/mach/debug_ll.h b/arch/arm/mach-bcm283x/include/mach/debug_ll.h index 4bfa5abc7c..db23112aa0 100644 --- a/arch/arm/mach-bcm283x/include/mach/debug_ll.h +++ b/arch/arm/mach-bcm283x/include/mach/debug_ll.h @@ -66,6 +66,12 @@ static inline void debug_ll_init(void) debug_ll_ns16550_init(divisor); } +#else + +static inline void debug_ll_init(void) +{ +} + #endif #endif /* __MACH_BCM2835_DEBUG_LL_H__ */ diff --git a/images/Makefile.bcm283x b/images/Makefile.bcm283x index 82787f972c..b591cd58f5 100644 --- a/images/Makefile.bcm283x +++ b/images/Makefile.bcm283x @@ -18,3 +18,7 @@ image-$(CONFIG_MACH_RPI3) += barebox-raspberry-pi-3.img pblb-$(CONFIG_MACH_RPI_CM3) += start_raspberry_pi_cm3 FILE_barebox-raspberry-pi-cm3.img = start_raspberry_pi_cm3.pblb image-$(CONFIG_MACH_RPI_CM3) += barebox-raspberry-pi-cm3.img + +pblb-$(CONFIG_MACH_RPI_COMMON) += start_raspberry_pi_generic +FILE_barebox-raspberry-pi.img = start_raspberry_pi_generic.pblb +image-$(CONFIG_MACH_RPI_COMMON) += barebox-raspberry-pi.img |