add 1M file system for generic 4M module

Author: pgollor

boards.txt

@@ -112,6 +112,15 @@ generic.menu.FlashSize.2M.build.spiffs_end=0x1FB000
 generic.menu.FlashSize.2M.build.spiffs_blocksize=8192
 generic.menu.FlashSize.2M.upload.maximum_size=1044464
 
+generic.menu.FlashSize.4M1M=4M (1M SPIFFS)
+generic.menu.FlashSize.4M1M.build.flash_size=4M
+generic.menu.FlashSize.4M1M.build.flash_ld=eagle.flash.4m1m.ld
+generic.menu.FlashSize.4M1M.build.spiffs_start=0x300000
+generic.menu.FlashSize.4M1M.build.spiffs_end=0x3FB000
+generic.menu.FlashSize.4M1M.build.spiffs_blocksize=8192
+generic.menu.FlashSize.4M1M.build.spiffs_pagesize=256
+generic.menu.FlashSize.4M1M.upload.maximum_size=3044464
+
 generic.menu.FlashSize.4M=4M (3M SPIFFS)
 generic.menu.FlashSize.4M.build.flash_size=4M
 generic.menu.FlashSize.4M.build.flash_ld=eagle.flash.4m.ld