Remove legacy examples

Signed-off-by: Nathaniel Graff <nathaniel.graff@sifive.com>

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);
-}