add SPIFS support to up to 16MB flash chips

Author: ficeto

boards.txt

@@ -85,6 +85,16 @@ generic.menu.FlashSize.4M.build.flash_size=4M
 generic.menu.FlashSize.4M.build.flash_ld=eagle.flash.4m.ld
 generic.menu.FlashSize.4M.build.spiffs_start=0x100000
 generic.menu.FlashSize.4M.build.spiffs_end=0x3FB000
+generic.menu.FlashSize.8M=8M (7M SPIFFS)
+generic.menu.FlashSize.8M.build.flash_size=1M
+generic.menu.FlashSize.8M.build.flash_ld=eagle.flash.8m.ld
+generic.menu.FlashSize.8M.build.spiffs_start=0x100000
+generic.menu.FlashSize.8M.build.spiffs_end=0x800000
+generic.menu.FlashSize.16M=16M (15M SPIFFS)
+generic.menu.FlashSize.16M.build.flash_size=1M
+generic.menu.FlashSize.16M.build.flash_ld=eagle.flash.16m.ld
+generic.menu.FlashSize.16M.build.spiffs_start=0x100000
+generic.menu.FlashSize.16M.build.spiffs_end=0x1000000
 
 # generic.menu.FlashFreq.40=40MHz
 # generic.menu.FlashFreq.40.build.flash_freq=40

cores/esp8266/spiffs/spiffs_esp8266.c

@@ -11,7 +11,10 @@
 bool flashmem_erase_sector( uint32_t sector_id ){
   WDT_RESET();
   noInterrupts();
+  uint32_t chip_size = flashchip->chip_size;
+  flashchip->chip_size = 0x01000000;
   bool erased = spi_flash_erase_sector( sector_id ) == SPI_FLASH_RESULT_OK;
+  flashchip->chip_size = chip_size;
   interrupts();
   return erased;
 }
@@ -30,7 +33,10 @@ uint32_t flashmem_write_internal( const void *from, uint32_t toaddr, uint32_t si
   }
   WDT_RESET();
   noInterrupts();
+  uint32_t chip_size = flashchip->chip_size;
+  flashchip->chip_size = 0x01000000;
   r = spi_flash_write(toaddr, apbuf?(uint32 *)apbuf:(uint32 *)from, size);
+  flashchip->chip_size = chip_size;
   interrupts();
   if(apbuf)
     os_free(apbuf);
@@ -48,7 +54,10 @@ uint32_t flashmem_read_internal( void *to, uint32_t fromaddr, uint32_t size ){
   SpiFlashOpResult r;
   WDT_RESET();
   noInterrupts();
+  uint32_t chip_size = flashchip->chip_size;
+  flashchip->chip_size = 0x01000000;
   r = spi_flash_read(fromaddr, (uint32 *)to, size);
+  flashchip->chip_size = chip_size;
   interrupts();
   if(SPI_FLASH_RESULT_OK == r)
     return size;