Erase flash before writing upload image

httpd/httpd.c

@@ -332,6 +332,10 @@ uint8_t stream_upload(uint16_t bptr)
 			if (write_len >= FLASHMEM_PAGE_SIZE) {
 				dbg_string("len: "); dbg_short(write_len); dbg_char(' ');
 				dbg_string("CRC16: "); dbg_short(crc_value); dbg_char('\n');
+				if (uptr % FLASH_SECTOR_SIZE == 0) {
+					flash_region.addr = uptr;
+					flash_sector_erase();
+				}
 				flash_region.addr = uptr;
 				flash_region.len = FLASHMEM_PAGE_SIZE;
 				flash_write_bytes(flash_buf);

rtl837x_flash.h

@@ -1,6 +1,8 @@
 #ifndef _RTL837X_FLASH_H_
 #define _RTL837X_FLASH_H_
 
+#define FLASH_SECTOR_SIZE 0x1000
+
 void flash_init(uint8_t enable_dio);
 void flash_read_uid(void);
 void flash_write_enable(void);