Give more space to the bootloader (0x200 bytes)

Author: facchinm

bootloaders/atmega4809_uart_bl.hex

@@ -1,18 +1,19 @@
-:10000000112480911F138B3E09F05BC08FEF80930A
+:10000000112480911F138B3E09F05FC08FEF809306
 :100010001F1393E08DE984BF90930010809102102C
 :1000200081FDFCCF80EC80930608A09123110A2E5D
-:10003000000CBB0BBC5F2CE530E00E946800DC01CB
+:10003000000CBB0BBC5F2CE530E00E946C00DC01C7
 :10004000CB019E5FAF4FBF4F2AE0B595A79597951F
 :1000500087952A95D1F78093080890930908809195
-:10006000E20581608093E205049A669A8091040813
-:1000700087FFFCCF80910008E0E0F1E49DE923E0F8
-:1000800030E48091040887FFFCCF809100088093C2
-:1000900002088193AF014F775527452B51F494BF48
-:1000A000209300108091021080FDFCCF8DB183273A
-:1000B0008DB9309731F791E088ED84BF909341007E
-:1000C00007C082E080930110E0E8F0E00995AACF34
-:1000D0000E946F00B7FF0895821B930B0895A29FA3
-:1000E000B001B39FC001A39F700D811D1124911D0C
-:0C00F000B29F700D811D1124911D089518
+:10006000E20581608093E205049A669AE0E0F2E49A
+:100070002DE933E040E41EC08091040887FFFCCFE7
+:1000800080910008E11552E4F50711F4882391F0FE
+:10009000809302088193CF018F779927892B51F4A0
+:1000A00024BF309300108091021080FDFCCF8DB1F1
+:1000B00084278DB9CF0190548115904CE8F291E0DE
+:1000C00088ED84BF9093410007C082E080930110C7
+:1000D000E0E0F1E00995A6CF0E947300B7FF089514
+:1000E000821B930B0895A29FB001B39FC001A39FF1
+:1000F000700D811D1124911DB29F700D811D112461
+:04010000911D0895B0
 :02000004008278
 :00000001FF

bootloaders/boot.c

@@ -28,7 +28,7 @@
  * For the code to be placed in the constructors section it is necessary
  * to disable standard startup files in Toolchain->AVR/GNU Linker->General.
  *
- * The example is written for ATtiny817 with the following pinout:
+ * This file is targeted to UNO WiFi REV2 (ATmega4809)
  * USART0 TxD PA4
  * USART0 RxD PA5
  * LED0       PD6
@@ -49,7 +49,7 @@
  * BOOTEND_FUSE * 256 must be above Bootloader Program Memory Usage,
  * this is 194 bytes at optimization level -O3, so BOOTEND_FUSE = 0x01
  */
-#define BOOTEND_FUSE               (0x01)
+#define BOOTEND_FUSE               (0x02)
 #define BOOT_SIZE                  (BOOTEND_FUSE * 0x100)
 #define MAPPED_APPLICATION_START   (MAPPED_PROGMEM_START + BOOT_SIZE)
 #define MAPPED_APPLICATION_SIZE    (MAPPED_PROGMEM_SIZE - BOOT_SIZE)
@@ -102,9 +102,6 @@ __attribute__((naked)) __attribute__((section(".ctors"))) void boot(void)
   init_uart();
   init_status_led();
 
-  /* HACK: esp32 seems to send an extra byte at the beginning */
-  uart_receive();
-
   /*
    * Start programming at start for application section
    * Subtract MAPPED_PROGMEM_START in condition to handle overflow on large flash sizes
@@ -113,12 +110,10 @@ __attribute__((naked)) __attribute__((section(".ctors"))) void boot(void)
   while(app_ptr - MAPPED_PROGMEM_START <= (uint8_t *)PROGMEM_END) {
     /* Receive and echo data before loading to memory */
     uint8_t rx_data = uart_receive();
-#if 0
     if (app_ptr == (uint8_t *)MAPPED_APPLICATION_START && rx_data == 0) {
       // skip first character if 0x00
       continue;
     }
-#endif
     uart_send(rx_data);
 
     /* Incremental load to page buffer before writing to Flash */

fuses/fuses_4809.bin

@@ -21,7 +21,7 @@ compiler.warning_flags.all=-Wall -Wextra
 compiler.path={runtime.tools.avr-gcc-5.4.0-atmel3.6.1-arduino2.path}/bin/
 compiler.c.cmd=avr-gcc
 compiler.c.flags=-c -g -Os {compiler.warning_flags} -std=gnu11 -ffunction-sections -fdata-sections -MMD -flto -fno-fat-lto-objects
-compiler.c.elf.flags={compiler.warning_flags} -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -Wl,--section-start=.text=0x100
+compiler.c.elf.flags={compiler.warning_flags} -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -Wl,--section-start=.text=0x200
 compiler.c.elf.cmd=avr-gcc
 compiler.S.flags=-c -g -x assembler-with-cpp -flto -MMD
 compiler.cpp.cmd=avr-g++