diff options
Diffstat (limited to 'roms/u-boot/board/lego/ev3')
| -rw-r--r-- | roms/u-boot/board/lego/ev3/Kconfig | 12 | ||||
| -rw-r--r-- | roms/u-boot/board/lego/ev3/MAINTAINERS | 6 | ||||
| -rw-r--r-- | roms/u-boot/board/lego/ev3/Makefile | 8 | ||||
| -rw-r--r-- | roms/u-boot/board/lego/ev3/README | 55 | ||||
| -rw-r--r-- | roms/u-boot/board/lego/ev3/legoev3.c | 142 |
5 files changed, 223 insertions, 0 deletions
diff --git a/roms/u-boot/board/lego/ev3/Kconfig b/roms/u-boot/board/lego/ev3/Kconfig new file mode 100644 index 000000000..14b3f0c1c --- /dev/null +++ b/roms/u-boot/board/lego/ev3/Kconfig @@ -0,0 +1,12 @@ +if TARGET_LEGOEV3 + +config SYS_BOARD + default "ev3" + +config SYS_VENDOR + default "lego" + +config SYS_CONFIG_NAME + default "legoev3" + +endif diff --git a/roms/u-boot/board/lego/ev3/MAINTAINERS b/roms/u-boot/board/lego/ev3/MAINTAINERS new file mode 100644 index 000000000..11b326160 --- /dev/null +++ b/roms/u-boot/board/lego/ev3/MAINTAINERS @@ -0,0 +1,6 @@ +LEGOEV3 BOARD +M: David Lechner <david@lechnology.com> +S: Maintained +F: board/lego/ev3/ +F: include/configs/legoev3.h +F: configs/legoev3_defconfig diff --git a/roms/u-boot/board/lego/ev3/Makefile b/roms/u-boot/board/lego/ev3/Makefile new file mode 100644 index 000000000..11b52ca1d --- /dev/null +++ b/roms/u-boot/board/lego/ev3/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0+ +# +# (C) Copyright 2000, 2001, 2002 +# Wolfgang Denk, DENX Software Engineering, wd@denx.de. +# +# Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> + +obj-y += legoev3.o diff --git a/roms/u-boot/board/lego/ev3/README b/roms/u-boot/board/lego/ev3/README new file mode 100644 index 000000000..9ad93e820 --- /dev/null +++ b/roms/u-boot/board/lego/ev3/README @@ -0,0 +1,55 @@ +Summary +======= + +LEGO MINDSTORMS EV3 is a toy robot produced by the LEGO Group. It is based +on the davinci da850 evm. The EV3 has a 16MB spi flash and a SDHC microSD card +reader. + +Booting +======= + +The EV3 contains a bootloader in EEPROM that loads u-boot.bin from address 0x0 +of the SPI flash memory (with a size of 256KiB!). Because the EEPROM is read- +only and it takes care of low level configuration (PLL and DDR), we don't use +U-Boot to produce an SPL image. + +Using the default configuration, U-Boot had a boot scrips that works as follows: + +* Check to see if microSD card is present +* If it is, try to load boot.scr from the first FAT partition +* If loading boot.scr was successful, run it +* Otherwise, try loading uEnv.txt +* If loading uEnv.txt was successful, import it +* If there is a uenvcmd variable (from uEnv.txt), run it +* Try to load uImage from the first FAT partition +* If it was successful, try to load da850-lego-ev3.dtb +* If loading uImage was successful, boot it (DT is optional) +* If none of the above was successful, try booting from flash + +Suggested Flash Memory Layout +============================= + +The following is based on the default U-Boot configuration: + +| Image (file) | Start Addr. | Max. Size | ++--------------------+-------------+-------------------+ +| u-boot.bin | 0x0 | 0x40000 (256KiB) | +| da850-lego-ev3.dtb | 0x40000 | 0x10000 (64KiB) | +| uImage | 0x50000 | 0x400000 (4MiB) | +| rootfs (squashfs) | 0x450000 | 0xa00000 (10MiB) | + +Writing image to flash +====================== + +The EEPROM contains a program for uploading an image file to the flash memory. +The program is started by holding down the right button on the EV3 when powering +it on. You can also `run fwupdateboot` in the u-boot shell to reboot into this +mode. The image can then be uploaded using the official LEGO MINDSTORMS EV3 +software or a 3rd party program capable of uploading a firmware file. + +If you are booting from the microSD card, it is enough to just write uboot.bin +to the flash. If you are not using a microSD card, you will need to create an +image file using the layout described above. + +IMPORTANT: The EEPROM bootloader only copies 256k, so u-boot.img must not +exceed that size! diff --git a/roms/u-boot/board/lego/ev3/legoev3.c b/roms/u-boot/board/lego/ev3/legoev3.c new file mode 100644 index 000000000..980ffef4c --- /dev/null +++ b/roms/u-boot/board/lego/ev3/legoev3.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2016 David Lechner <david@lechnology.com> + * + * Based on da850evm.c + * + * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/ + * + * Based on da830evm.c. Original Copyrights follow: + * + * Copyright (C) 2009 Nick Thompson, GE Fanuc, Ltd. <nick.thompson@gefanuc.com> + * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> + */ + +#include <common.h> +#include <env.h> +#include <i2c.h> +#include <init.h> +#include <spi.h> +#include <spi_flash.h> +#include <asm/arch/hardware.h> +#include <asm/arch/pinmux_defs.h> +#include <asm/global_data.h> +#include <asm/io.h> +#include <asm/arch/davinci_misc.h> +#include <linux/errno.h> +#include <hwconfig.h> +#include <asm/mach-types.h> +#include <asm/setup.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define EEPROM_I2C_ADDR 0x50 +#define EEPROM_REV_OFFSET 0x3F00 +#define EEPROM_BDADDR_OFFSET 0x3F06 + +const struct pinmux_resource pinmuxes[] = { + PINMUX_ITEM(spi0_pins_base), + PINMUX_ITEM(spi0_pins_scs0), + PINMUX_ITEM(uart1_pins_txrx), + PINMUX_ITEM(i2c0_pins), + PINMUX_ITEM(mmc0_pins), +}; + +const int pinmuxes_size = ARRAY_SIZE(pinmuxes); + +const struct lpsc_resource lpsc[] = { + { DAVINCI_LPSC_SPI0 }, /* Serial Flash */ + { DAVINCI_LPSC_UART1 }, /* console */ + { DAVINCI_LPSC_MMC_SD }, +}; + +const int lpsc_size = ARRAY_SIZE(lpsc); + +/* + * The Bluetooth address serves as the board serial number. + */ +static void setup_serial_number(void) +{ + u32 offset; + char serial_number[13]; + u8 buf[6]; + u8 eeprom_rev; + + if (env_get("serial#")) + return; + + if (i2c_read(EEPROM_I2C_ADDR, EEPROM_REV_OFFSET, 2, buf, 2)) { + printf("\nEEPROM revision read failed!\n"); + return; + } + + /* + * EEPROM rev 3 has Bluetooth address at EEPROM_REV_OFFSET. + * Other revisions have checksum at EEPROM_REV_OFFSET+1 + * to detect this. + */ + if ((buf[0] ^ buf[1]) == 0xFF) + eeprom_rev = buf[0]; + else + eeprom_rev = 3; + + /* EEPROM rev 3 has Bluetooth address where rev should be */ + offset = (eeprom_rev == 3) ? EEPROM_REV_OFFSET : EEPROM_BDADDR_OFFSET; + + if (i2c_read(EEPROM_I2C_ADDR, offset, 2, buf, 6)) { + printf("\nEEPROM serial read failed!\n"); + return; + } + + sprintf(serial_number, "%02X%02X%02X%02X%02X%02X", + buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]); + + env_set("serial#", serial_number); +} + +int board_early_init_f(void) +{ + /* enable the console UART */ + writel((DAVINCI_UART_PWREMU_MGMT_FREE | DAVINCI_UART_PWREMU_MGMT_URRST | + DAVINCI_UART_PWREMU_MGMT_UTRST), + &davinci_uart1_ctrl_regs->pwremu_mgmt); + + /* + * Power on required peripherals + * ARM does not have access by default to PSC0 and PSC1 + * assuming here that the DSP bootloader has set the IOPU + * such that PSC access is available to ARM + */ + if (da8xx_configure_lpsc_items(lpsc, ARRAY_SIZE(lpsc))) + return 1; + + return 0; +} + +int board_init(void) +{ + irq_init(); + + /* address of boot parameters */ + gd->bd->bi_boot_params = LINUX_BOOT_PARAM_ADDR; + + /* setup the SUSPSRC for ARM to control emulation suspend */ + writel(readl(&davinci_syscfg_regs->suspsrc) & + ~(DAVINCI_SYSCFG_SUSPSRC_I2C | + DAVINCI_SYSCFG_SUSPSRC_SPI0 | DAVINCI_SYSCFG_SUSPSRC_TIMER0 | + DAVINCI_SYSCFG_SUSPSRC_UART1), + &davinci_syscfg_regs->suspsrc); + + /* configure pinmux settings */ + if (davinci_configure_pin_mux_items(pinmuxes, ARRAY_SIZE(pinmuxes))) + return 1; + + return 0; +} + +int board_late_init(void) +{ + setup_serial_number(); + + return 0; +} |