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authorNathaniel Graff <nathaniel.graff@sifive.com>2019-03-07 21:32:52 +0000
committerGitHub <noreply@github.com>2019-03-07 21:32:52 +0000
commit7b036c07e40a6f3d3cf1ddfc5d88d3a36beb4e46 (patch)
treec1459952c20e4534d33016d4fc2cf6729228c0e6 /software/double_tap_dontboot
parent84781219c87c0b9148e318f3e358ef7de03e251c (diff)
parentdef12d50a686774196c613a819e6afb744ee290e (diff)
Merge pull request #195 from sifive/remove-legacy
Remove legacy BSPs and Software
Diffstat (limited to 'software/double_tap_dontboot')
-rw-r--r--software/double_tap_dontboot/.unsupported-boards3
-rw-r--r--software/double_tap_dontboot/Makefile6
-rw-r--r--software/double_tap_dontboot/double_tap_dontboot.c153
3 files changed, 0 insertions, 162 deletions
diff --git a/software/double_tap_dontboot/.unsupported-boards b/software/double_tap_dontboot/.unsupported-boards
deleted file mode 100644
index 4e93148..0000000
--- a/software/double_tap_dontboot/.unsupported-boards
+++ /dev/null
@@ -1,3 +0,0 @@
-coreplexip-e31-arty
-coreplexip-e51-arty
-
diff --git a/software/double_tap_dontboot/Makefile b/software/double_tap_dontboot/Makefile
deleted file mode 100644
index ae89c51..0000000
--- a/software/double_tap_dontboot/Makefile
+++ /dev/null
@@ -1,6 +0,0 @@
-TARGET = double_tap_dontboot
-C_SRCS += double_tap_dontboot.c
-CFLAGS += -O2 -fno-builtin-printf -DNO_INIT
-
-BSP_BASE = ../../bsp
-include $(BSP_BASE)/env/common.mk
diff --git a/software/double_tap_dontboot/double_tap_dontboot.c b/software/double_tap_dontboot/double_tap_dontboot.c
deleted file mode 100644
index 53c2c64..0000000
--- a/software/double_tap_dontboot/double_tap_dontboot.c
+++ /dev/null
@@ -1,153 +0,0 @@
-// See LICENSE for license details.
-
-// This is the 'bootloader' which ships on HiFive1 boards,
-// at SPI Flash location 0x20000000.
-// HiFive1 boards have code burned into their OTP which ends with
-// a jump to 0x20000000. The Freedom E SDK and the Arduino IDE
-// linker scripts cause user programs to be compiled and
-// flashed at 0x20400000. Therefore, this code ultimately jumps
-// to 0x20400000, while attempting to leave the machine state as close
-// to its reset state as possible.
-//
-// When compiled in the freedom-e-sdk environment, this code will
-// be compiled as a user program at 0x20400000, so will continuously jump to itself.
-// It is provided in the freedom-e-sdk mostly for reference purposes, so
-// users know what is running on their board. Replacing the bootloader
-// at 0x20000000 is not currently supported by the SDK.
-//
-// These are the instructions for the user of this program, from the
-// HiFive1 Getting Started Guide:
-//
-// This program is designed to allow quick boot, but
-// also a "safe" reboot option if a "bad" program
-// is flashed into the HiFive1's SPI Flash. A "bad" program
-// is one which makes it impossible for the programmer
-// to communicate with the HiFive1. For example, a program which
-// disables FE310's active clock, or which puts the FE310 to sleep
-// with no way of waking it up. Bad programs can always be restarted using
-// the RESET button, and using the "safe" bootloader can be halted
-// before they perform any unsafe behavior.
-//
-// To activate "normal" boot mode, press the RESET button on
-// the HiFive1. After approximately 1s, the green LED will flash
-// for 1/2 second, then the user program will execute.
-//
-// To activate "safe" boot mode, press the RESET button. When
-// the green LED flashes, immediately press the RESET button again.
-// After 1 second, the red LED will blink. The user program will not
-// execute, and the programmer can connect. To exit "safe" boot mode,
-// press the RESET button a final time.
-
-#include <stdint.h>
-#include "platform.h"
-#include "encoding.h"
-
-#ifndef _SIFIVE_HIFIVE1_H
-#error "double_tap_dontboot is designed to run on HiFive1 and/or E300 Arty Dev Kit."
-#endif
-
-
-#define BACKUP15_MAGIC 0xD027B007
-
-#define FINAL_ADDRESS 0x20400000
-
-#define RED_LED 22
-#define GREEN_LED 19
-
-int main(void)
-{
- uint64_t now;
- uint64_t then;
-
- // Restore the default mtvec (which may have been set by initialization
- // code, depending on the environment in which this C code is compiled).
- // By default, this would cause an infinite loop upon exception, which is
- // also "safe" behavior and the debugger can connect.
-
- write_csr(mtvec, 0x0);
-
- // How did we get here? We only want to execute this code
- // on resets (vs waking up from sleep).
- if ((AON_REG(AON_PMUCAUSE) & AON_PMUCAUSE_WAKEUPCAUSE) ==
- AON_WAKEUPCAUSE_RESET) {
-
- if (AON_REG(AON_BACKUP15) == BACKUP15_MAGIC) {
- // Reset was "double-tapped".
-
- // Re-arm the reset double-tap
- AON_REG(AON_BACKUP15) = 0;
-
- // PWM Red LED
-
- GPIO_REG(GPIO_IOF_EN) |= (1 << RED_LED);
- GPIO_REG(GPIO_OUTPUT_XOR) &= ~(1 << RED_LED);
- GPIO_REG(GPIO_IOF_SEL) |= (1 << RED_LED);
-
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~(1 << GREEN_LED);
- GPIO_REG(GPIO_OUTPUT_XOR) &= ~(1 << GREEN_LED);
- GPIO_REG(GPIO_OUTPUT_EN) &= ~(1 << GREEN_LED);
-
- PWM1_REG(PWM_CFG) = 0;
- PWM1_REG(PWM_COUNT) = 0;
- PWM1_REG(PWM_CMP0) = 0xFF;
- PWM1_REG(PWM_CMP3) = 0xFF;
- PWM1_REG(PWM_CFG) = PWM_CFG_ENALWAYS;
-
- int pwm_val = 255;
-
- // Wait for debugger or another RESET press.
- while(1){
-
- // Make the PWM a fade. This is preferable to just a PWM blink
- // because it makes it clear that the processor is actually
- // running this code, not just the PWM hardware.
-
- now = *((volatile uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME));
- then = now + 32768/500;
- while (*((volatile uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME)) < then) {
- asm volatile ("");
- }
- pwm_val = (pwm_val == 0) ? 255 : (pwm_val -1);
- PWM1_REG(PWM_CMP3) = pwm_val << 4;
- }
-
- } // If Magic
-
- // Turn on Green LED to indicate time-to-double-tap
- // LEDs are Active-Low
- GPIO_REG(GPIO_OUTPUT_VAL) |= (1 << GREEN_LED);
- GPIO_REG(GPIO_OUTPUT_XOR) |= (1 << GREEN_LED);
- GPIO_REG(GPIO_OUTPUT_EN) |= (1 << GREEN_LED);
-
- // Re-arm the reset double-tap
- uint32_t save = AON_REG(AON_BACKUP15);
-
- AON_REG(AON_BACKUP15) = BACKUP15_MAGIC;
-
- // Wait 500 ms. If reset is tapped at this point,
- // we will execute the "magic" loop above.
- now = *((volatile uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME));
- then = now + 32768/2;
- while (*((volatile uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME)) < then) {
- asm volatile ("");
- }
-
- // Re-arm the reset double-tap
- AON_REG(AON_BACKUP15) = save;
-
- }
-
- // Restore the GPIO Registers to their default
- GPIO_REG(GPIO_OUTPUT_VAL) = 0;
- GPIO_REG(GPIO_OUTPUT_XOR) = 0;
- GPIO_REG(GPIO_OUTPUT_EN) = 0;
-
- // Jump to "user code" in SPI Flash.
- void (*pgm_start)(void) = (void*) FINAL_ADDRESS;
- pgm_start();
-
- // This value is meaningless, but
- // since this code should never be reached,
- // make it non-zero.
- return (1234567);
-}