Q about bootstrap support for at91sam92* boards and proposal for retirement
Ahmad Fatoum
a.fatoum at pengutronix.de
Tue Jan 11 00:08:15 PST 2022
Hi Sam,
On 09.01.22 20:53, Sam Ravnborg wrote:
> Hi,
>>
>> Can anyone (Ahmad?) help me a little how to get the bootstrap
>> functionality working on the at91sam9263?
>
> To answer the obvious questions - what have I done so far.
>
> - I have an at91bootstrap generated BOOT.BIN that works.
> This ruins out a lot of possible issues with the SD card
> as the board boots from the SD card with the at91bootstrap based
> BOOT.BIN.
So the arm9cpu boots XIP from NAND, but the 9263ek boots from SD?
Did I get that right?
> - The toolchain used is generated from buildroot, and I do not have any
> proof that it works as I have not had any successes.
> So far I have assumed that it works.
>
> - The configuration used is pasted below.
>
> - The board I use is the skov-arm9cpu which I know works as it boots
> barebox with the at91bootstrap BOOT.BIN
>
> - I have only a limited set of patches - pasted below.
>
> - Latest barebox from the master branch
>
> - I have tried to power cycle and reset of the board - no change
>
> - There is a ">RomBOOT" prompt - but nothing else
>
> Sam
>
>
> diff --git a/arch/arm/boards/skov-arm9cpu/lowlevel.c b/arch/arm/boards/skov-arm9cpu/lowlevel.c
> index d335953a7..8d5c0b025 100644
> --- a/arch/arm/boards/skov-arm9cpu/lowlevel.c
> +++ b/arch/arm/boards/skov-arm9cpu/lowlevel.c
> @@ -3,14 +3,20 @@
>
> #include <linux/sizes.h>
>
> +#include <debug_ll.h>
> +
> #include <asm/barebox-arm.h>
>
> #include <mach/at91sam926x_board_init.h>
> #include <mach/at91sam9263_matrix.h>
> +#include <mach/at91_dbgu.h>
> +#include <mach/iomux.h>
>
> #define MASTER_PLL_MUL 171
> #define MASTER_PLL_DIV 14
>
> +#define MASTER_CLOCK (200000000/2)
> +
> static void __bare_init skovarm9cpu_board_config(struct at91sam926x_board_cfg *cfg)
> {
> /* Disable Watchdog */
> @@ -96,6 +102,18 @@ static void __bare_init skovarm9cpu_board_config(struct at91sam926x_board_cfg *c
> AT91_RSTC_RSTTYP_WATCHDOG;
> }
>
> +static void dbgu_init(void)
> +{
> + void __iomem *pio = IOMEM(AT91SAM9263_BASE_PIOC);
> + // Setup DBGU uart
> + at91_mux_pio3_pin(pio, pin_to_mask(AT91_PIN_PC30), AT91_MUX_PERIPH_A, GPIO_PULL_UP); // DRXD
> + at91_mux_pio3_pin(pio, pin_to_mask(AT91_PIN_PC31), AT91_MUX_PERIPH_A, 0); // DTXD
> +
> + at91_dbgu_setup_ll(IOMEM(AT91_BASE_DBGU1), MASTER_CLOCK, 115200);
> + pbl_set_putc(at91_dbgu_putc, IOMEM(AT91_BASE_DBGU1));
That's not safe to call here. pbl_set_putc accesses global variables, but there has
been no relocation yet.
> + putc_ll('#');
> +}
> +
> static void __bare_init skov_arm9cpu_init(void *fdt)
> {
> struct at91sam926x_board_cfg cfg;
> @@ -108,6 +126,8 @@ static void __bare_init skov_arm9cpu_init(void *fdt)
> skovarm9cpu_board_config(&cfg);
> at91sam9263_board_init(&cfg);
>
> + dbgu_init();
> +
If you have a functional skov arm9cpu configuration. Could you figure out the bare
minimum of clock setup you need for DEBUG_LL to work and move that further up?
Once you get get to the barebox_arm_entry, you'll want to call into the PBL
xload from MMC stuff instead, like Oleksij did for the SAMA5D3.
Cheers,
Ahmad
> barebox_arm_entry(AT91_CHIPSELECT_1, at91_get_sdram_size(cfg.sdramc),
> fdt);
> }
>
> #
> # Automatically generated file; DO NOT EDIT.
> # Barebox/arm 2021.12.0 Configuration
> #
> CONFIG_ARM=y
> CONFIG_HAVE_MACH_ARM_HEAD=y
> CONFIG_ARM_USE_COMPRESSED_DTB=y
> CONFIG_TEXT_BASE=0x0
>
> #
> # System Type
> #
> CONFIG_ARCH_AT91=y
> # CONFIG_ARCH_BCM283X is not set
> # CONFIG_ARCH_CLPS711X is not set
> # CONFIG_ARCH_DAVINCI is not set
> # CONFIG_ARCH_DIGIC is not set
> # CONFIG_ARCH_EP93XX is not set
> # CONFIG_ARCH_IMX is not set
> # CONFIG_ARCH_LAYERSCAPE is not set
> # CONFIG_ARCH_MVEBU is not set
> # CONFIG_ARCH_MXS is not set
> # CONFIG_ARCH_NOMADIK is not set
> # CONFIG_ARCH_OMAP is not set
> # CONFIG_ARCH_PXA is not set
> # CONFIG_ARCH_ROCKCHIP is not set
> # CONFIG_ARCH_SOCFPGA is not set
> # CONFIG_ARCH_S3C24xx is not set
> # CONFIG_ARCH_S5PCxx is not set
> # CONFIG_ARCH_S3C64xx is not set
> # CONFIG_ARCH_STM32MP is not set
> # CONFIG_ARCH_VERSATILE is not set
> # CONFIG_ARCH_VEXPRESS is not set
> # CONFIG_ARCH_TEGRA is not set
> # CONFIG_ARCH_UEMD is not set
> # CONFIG_ARCH_ZYNQ is not set
> # CONFIG_ARCH_ZYNQMP is not set
> # CONFIG_ARCH_ARM64_VIRT is not set
>
> #
> # Processor Type
> #
> CONFIG_CPU_32=y
> CONFIG_CPU_ARM926T=y
> CONFIG_CPU_32v5=y
>
> #
> # processor features
> #
> # CONFIG_BOOT_ENDIANNESS_SWITCH is not set
> CONFIG_HAVE_AT91_UTMI=y
> CONFIG_HAVE_AT91_USB_CLK=y
> CONFIG_COMMON_CLK_AT91=y
> CONFIG_HAVE_AT91_SMD=y
> CONFIG_HAVE_AT91_BOOTSTRAP=y
> CONFIG_AT91SAM926X_BOARD_INIT=y
> CONFIG_AT91SAM9_SMC=y
> CONFIG_HAVE_AT91SAM9_RST=y
> CONFIG_SOC_AT91SAM9=y
> CONFIG_ARCH_TEXT_BASE=0x23f00000
> CONFIG_HAVE_AT91_LOAD_BAREBOX_SRAM=y
>
> #
> # Atmel AT91 System-on-Chip
> #
> CONFIG_SOC_AT91SAM9263=y
> CONFIG_AT91_MULTI_BOARDS=y
> CONFIG_MACH_SKOV_ARM9CPU=y
> # CONFIG_MACH_AT91SAM9263EK is not set
> # CONFIG_MACH_AT91SAM9X5EK is not set
> # CONFIG_MACH_MICROCHIP_KSZ9477_EVB is not set
> # CONFIG_MACH_SAMA5D3_XPLAINED is not set
> # CONFIG_MACH_SAMA5D27_SOM1 is not set
> # CONFIG_MACH_SAMA5D27_GIANTBOARD is not set
>
> #
> # AT91 Board Options
> #
> CONFIG_AT91_BOOTSTRAP=y
> # CONFIG_AT91_LOAD_BAREBOX_SRAM is not set
> CONFIG_BAREBOX_MAX_IMAGE_SIZE=0x40000
> # CONFIG_BOARD_ARM_GENERIC_DT is not set
> # CONFIG_AEABI is not set
> # end of System Type
>
> #
> # ARM specific settings
> #
> # CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS is not set
> CONFIG_ARM_EXCEPTIONS=y
> # CONFIG_ARM_SEMIHOSTING is not set
> # end of ARM specific settings
>
> CONFIG_GREGORIAN_CALENDER=y
> CONFIG_HAS_KALLSYMS=y
> CONFIG_HAS_MODULES=y
> CONFIG_HAS_CACHE=y
> CONFIG_HAS_DMA=y
> CONFIG_HAS_ARCH_SJLJ=y
> CONFIG_GENERIC_GPIO=y
> CONFIG_BLOCK=y
> CONFIG_BLOCK_WRITE=y
> CONFIG_USE_COMPRESSED_DTB=y
> CONFIG_FILETYPE=y
>
> #
> # General Settings
> #
> CONFIG_LOCALVERSION=""
> CONFIG_LOCALVERSION_AUTO=y
> CONFIG_BANNER=y
> CONFIG_MEMINFO=y
> # CONFIG_ENVIRONMENT_VARIABLES is not set
> # CONFIG_GLOBALVAR is not set
>
> #
> # memory layout
> #
> CONFIG_HAVE_PBL_IMAGE=y
> CONFIG_HAVE_PBL_MULTI_IMAGES=y
> CONFIG_HAVE_IMAGE_COMPRESSION=y
> CONFIG_PBL_IMAGE=y
> CONFIG_PBL_MULTI_IMAGES=y
> CONFIG_PBL_RELOCATABLE=y
> CONFIG_IMAGE_COMPRESSION=y
> # CONFIG_IMAGE_COMPRESSION_LZ4 is not set
> CONFIG_IMAGE_COMPRESSION_LZO=y
> # CONFIG_IMAGE_COMPRESSION_GZIP is not set
> # CONFIG_IMAGE_COMPRESSION_XZKERN is not set
> # CONFIG_IMAGE_COMPRESSION_NONE is not set
> # CONFIG_MMU is not set
> CONFIG_BAREBOX_MAX_PBL_SIZE=0xffffffff
> CONFIG_BAREBOX_MAX_BARE_INIT_SIZE=0xffffffff
> CONFIG_STACK_SIZE=0x8000
> CONFIG_MALLOC_SIZE=0x400000
> # end of memory layout
>
> # CONFIG_EXPERIMENTAL is not set
> # CONFIG_MALLOC_DLMALLOC is not set
> CONFIG_MALLOC_TLSF=y
> # CONFIG_MALLOC_DUMMY is not set
> CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
> # CONFIG_KALLSYMS is not set
> CONFIG_RELOCATABLE=y
> # CONFIG_PANIC_HANG is not set
> CONFIG_PROMPT="barebox:"
> CONFIG_BAUDRATE=115200
> CONFIG_SIMPLE_READLINE=y
> CONFIG_CBSIZE=1024
> # CONFIG_SHELL_HUSH is not set
> # CONFIG_SHELL_SIMPLE is not set
> CONFIG_SHELL_NONE=y
> # CONFIG_GLOB is not set
> # CONFIG_PASSWORD is not set
> CONFIG_ERRNO_MESSAGES=y
> CONFIG_TIMESTAMP=y
> # CONFIG_BOOTM is not set
> # CONFIG_BAREBOX_UPDATE is not set
> # CONFIG_IMD is not set
> # CONFIG_CONSOLE_FULL is not set
> CONFIG_CONSOLE_SIMPLE=y
> # CONFIG_CONSOLE_NONE is not set
> # CONFIG_CONSOLE_ALLOW_COLOR is not set
> # CONFIG_CONSOLE_DISABLE_INPUT is not set
> CONFIG_PBL_CONSOLE=y
> CONFIG_PARTITION=y
> CONFIG_PARTITION_DISK=y
> CONFIG_PARTITION_DISK_DOS=y
> # CONFIG_PARTITION_DISK_EFI is not set
> # CONFIG_ENV_HANDLING is not set
> # CONFIG_DEFAULT_ENVIRONMENT is not set
> # CONFIG_DEFAULT_COMPRESSION_GZIP is not set
> # CONFIG_DEFAULT_COMPRESSION_LZO is not set
> CONFIG_DEFAULT_COMPRESSION_NONE=y
> CONFIG_HAS_SCHED=y
> CONFIG_POLLER=y
> # CONFIG_BTHREAD is not set
> # CONFIG_STATE is not set
> # CONFIG_BOOTCHOOSER is not set
> CONFIG_EXTERNAL_DTS_FRAGMENTS=""
>
> #
> # OP-TEE loading
> #
> # CONFIG_PBL_OPTEE is not set
> # end of OP-TEE loading
> # end of General Settings
>
> #
> # Debugging
> #
> CONFIG_COMPILE_LOGLEVEL=6
> CONFIG_DEFAULT_LOGLEVEL=7
> CONFIG_DEBUG_LL=y
> CONFIG_DEBUG_AT91_UART=y
> CONFIG_DEBUG_AT91_UART_BASE=0xffffee00
> # CONFIG_DEBUG_INITCALLS is not set
> # CONFIG_DEBUG_PROBES is not set
> # CONFIG_PBL_BREAK is not set
> # CONFIG_PRINTF_FULL is not set
> # CONFIG_UBSAN is not set
> CONFIG_HAVE_ARCH_KASAN=y
> CONFIG_CC_HAS_KASAN_GENERIC=y
> # CONFIG_KASAN is not set
> # CONFIG_COMPILE_TEST is not set
> # end of Debugging
>
> #
> # EFI (Extensible Firmware Interface) Support
> #
> # end of EFI (Extensible Firmware Interface) Support
>
> CONFIG_HAS_DEBUG_LL=y
> # CONFIG_NET is not set
>
> #
> # Drivers
> #
> CONFIG_OFTREE=y
> CONFIG_OFTREE_MEM_GENERIC=y
> CONFIG_DTC=y
> CONFIG_OFDEVICE=y
> CONFIG_OF_GPIO=y
> # CONFIG_OF_OVERLAY is not set
> # CONFIG_AIODEV is not set
>
> #
> # serial drivers
> #
> # CONFIG_DRIVER_SERIAL_ARM_DCC is not set
> # CONFIG_DRIVER_SERIAL_NS16550 is not set
> CONFIG_DRIVER_SERIAL_ATMEL=y
> # CONFIG_DRIVER_SERIAL_CADENCE is not set
> # CONFIG_SERIAL_SIFIVE is not set
> # end of serial drivers
>
> CONFIG_HAS_MACB=y
>
> #
> # SPI drivers
> #
> # CONFIG_SPI is not set
> # end of SPI drivers
>
> # CONFIG_I2C is not set
> # CONFIG_MTD is not set
> CONFIG_DISK=y
> CONFIG_DISK_WRITE=y
>
> #
> # drive types
> #
> # CONFIG_DISK_ATA is not set
> # CONFIG_DISK_AHCI is not set
>
> #
> # interface types
> #
> # CONFIG_DISK_INTF_PLATFORM_IDE is not set
> # CONFIG_USB_HOST is not set
> # CONFIG_USB_GADGET is not set
> # CONFIG_USB_MUSB is not set
> CONFIG_VIDEO=y
> # CONFIG_FRAMEBUFFER_CONSOLE is not set
> CONFIG_DRIVER_VIDEO_ATMEL=y
> # CONFIG_DRIVER_VIDEO_ATMEL_HLCD is not set
> # CONFIG_DRIVER_VIDEO_BOCHS_ISA is not set
> # CONFIG_DRIVER_VIDEO_SIMPLEFB_CLIENT is not set
> # CONFIG_DRIVER_VIDEO_SIMPLEFB is not set
> # CONFIG_DRIVER_VIDEO_EDID is not set
> CONFIG_DRIVER_VIDEO_BACKLIGHT=y
>
> #
> # Video encoder chips
> #
> # CONFIG_DRIVER_VIDEO_SIMPLE_PANEL is not set
> # CONFIG_SOUND is not set
> CONFIG_MCI=y
>
> #
> # --- Feature list ---
> #
> # CONFIG_MCI_STARTUP is not set
> CONFIG_MCI_WRITE=y
> CONFIG_MCI_MMC_BOOT_PARTITIONS=y
> # CONFIG_MCI_MMC_GPP_PARTITIONS is not set
>
> #
> # --- MCI host drivers ---
> #
> # CONFIG_MCI_DW is not set
> # CONFIG_MCI_ROCKCHIP_DWCMSHC is not set
> CONFIG_MCI_ATMEL=y
> # CONFIG_MCI_ATMEL_SDHCI is not set
> # CONFIG_MCI_ARASAN is not set
> CONFIG_HAVE_CLK=y
> CONFIG_CLKDEV_LOOKUP=y
> CONFIG_COMMON_CLK=y
> CONFIG_COMMON_CLK_OF_PROVIDER=y
>
> #
> # Clocksource
> #
> CONFIG_CLOCKSOURCE_DUMMY_RATE=1000
> CONFIG_CLOCKSOURCE_ATMEL_PIT=y
> # CONFIG_CLOCKSOURCE_DW_APB_TIMER is not set
> # end of Clocksource
>
> #
> # Multifunction device drivers
> #
> CONFIG_MFD_SYSCON=y
> # CONFIG_MFD_ATMEL_FLEXCOM is not set
> # end of Multifunction device drivers
>
> #
> # Misc devices
> #
> # CONFIG_JTAG is not set
> CONFIG_SRAM=y
> # CONFIG_DEV_MEM is not set
> # CONFIG_UBOOTVAR is not set
> # end of Misc devices
>
> CONFIG_LED=y
> CONFIG_LED_GPIO=y
> CONFIG_LED_GPIO_OF=y
> # CONFIG_LED_GPIO_RGB is not set
> # CONFIG_LED_GPIO_BICOLOR is not set
> CONFIG_LED_TRIGGERS=y
>
> #
> # EEPROM support
> #
> # end of EEPROM support
>
> #
> # Input device support
> #
> CONFIG_INPUT=y
> CONFIG_KEYBOARD_GPIO=y
> # CONFIG_INPUT_SPECIALKEYS is not set
> # end of Input device support
>
> # CONFIG_WATCHDOG is not set
> # CONFIG_PWM is not set
> # CONFIG_HWRNG is not set
>
> #
> # DMA support
> #
> # end of DMA support
>
> CONFIG_GPIOLIB=y
>
> #
> # GPIO
> #
> # CONFIG_GPIO_74XX_MMIO is not set
> # CONFIG_GPIO_GENERIC_PLATFORM is not set
> # CONFIG_GPIO_DESIGNWARE is not set
> # CONFIG_GPIO_SIFIVE is not set
> # end of GPIO
>
> # CONFIG_W1 is not set
>
> #
> # Pin controllers
> #
> CONFIG_PINCTRL=y
> CONFIG_PINCTRL_AT91=y
> # CONFIG_PINCTRL_AT91PIO4 is not set
> # CONFIG_PINCTRL_SINGLE is not set
> # end of Pin controllers
>
> # CONFIG_NVMEM is not set
>
> #
> # Bus devices
> #
> # end of Bus devices
>
> # CONFIG_REGULATOR is not set
>
> #
> # Remoteproc drivers
> #
> # CONFIG_REMOTEPROC is not set
> # end of Remoteproc drivers
>
> # CONFIG_RESET_CONTROLLER is not set
> # CONFIG_RTC_CLASS is not set
>
> #
> # Firmware Drivers
> #
> # end of Firmware Drivers
>
> #
> # FPGA Configuration Support
> #
> # CONFIG_FPGA is not set
> # end of FPGA Configuration Support
>
> # CONFIG_GENERIC_PHY is not set
> # CONFIG_CRYPTO_HW is not set
>
> #
> # Memory controller drivers
> #
> # end of Memory controller drivers
>
> #
> # i.MX SoC drivers
> #
> # end of i.MX SoC drivers
>
> #
> # NVME Support
> #
> # end of NVME Support
>
> # CONFIG_SYSCON_REBOOT_MODE is not set
> # CONFIG_POWER_RESET_SYSCON is not set
> # CONFIG_POWER_RESET_SYSCON_POWEROFF is not set
> # CONFIG_POWER_RESET_GPIO is not set
> # CONFIG_POWER_RESET_GPIO_RESTART is not set
> # CONFIG_VIRTIO_MENU is not set
> # end of Drivers
>
> #
> # Filesystem support
> #
> CONFIG_FS=y
> CONFIG_FS_LEGACY=y
>
> #
> # Some selected filesystems still use the legacy FS API.
> #
>
> #
> # Consider updating them.
> #
> # CONFIG_FS_CRAMFS is not set
> # CONFIG_FS_EXT4 is not set
> # CONFIG_FS_RAMFS is not set
> # CONFIG_FS_DEVFS is not set
> CONFIG_FS_FAT=y
> CONFIG_FS_FAT_WRITE=y
> CONFIG_FS_FAT_LFN=y
> # CONFIG_FS_BPKFS is not set
> # CONFIG_FS_UIMAGEFS is not set
> # CONFIG_FS_PSTORE is not set
> # CONFIG_FS_SQUASHFS is not set
>
> #
> # ZLIB support disabled
> #
>
> #
> # LZ4 support disabled
> #
>
> #
> # LZO support disabled
> #
>
> #
> # XZ support disabled
> #
>
> #
> # ZSTD support disabled
> #
> # end of Filesystem support
>
> #
> # Library routines
> #
> CONFIG_UNCOMPRESS=y
> CONFIG_ZLIB=y
> # CONFIG_BZLIB is not set
> # CONFIG_LZ4_DECOMPRESS is not set
> # CONFIG_ZSTD_DECOMPRESS is not set
> # CONFIG_XZ_DECOMPRESS is not set
> # CONFIG_BASE64 is not set
> CONFIG_LZO_DECOMPRESS=y
> # CONFIG_ALLOW_PRNG_FALLBACK is not set
> # CONFIG_CRC_CCITT is not set
> # CONFIG_CRC8 is not set
>
> #
> # Library gui routines
> #
> # end of Library gui routines
>
> # CONFIG_BAREBOX_LOGO is not set
> CONFIG_BOOTSTRAP=y
> CONFIG_BOOTSTRAP_DEVFS=y
> CONFIG_BOOTSTRAP_DISK=y
> # CONFIG_NLS is not set
> # CONFIG_BLOBGEN is not set
> CONFIG_ARCH_HAS_DATA_ABORT_MASK=y
> # end of Library routines
>
> #
> # Crypto support
> #
> # CONFIG_DIGEST is not set
> # CONFIG_CRYPTO_KEYSTORE is not set
> # end of Crypto support
>
> #
> # Firmware files
> #
> CONFIG_EXTRA_FIRMWARE_DIR="firmware"
> # end of Firmware files
>
> #
> # Host Tools
> #
> # CONFIG_COMPILE_HOST_TOOLS is not set
> # end of Host Tools
>
> #
> # Target Tools
> #
> # CONFIG_KERNEL_INSTALL_TARGET is not set
> # CONFIG_BAREBOXENV_TARGET is not set
> # CONFIG_BAREBOXCRC32_TARGET is not set
> # CONFIG_MVEBU_KWBOOT_TARGET is not set
> # end of Target Tools
>
> # CONFIG_TEST is not set
>
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