ARMmbed#80 Add incompatible image detection feature in details.txt fi…

…le. Add documentation on the feautre.

docs/MSD_COMMANDS.md

@@ -82,3 +82,8 @@ data fast enough from DAPLink and an overflow occurs the text ```<DAPLink:Overfl
 will show up in the serial data. Serial overflow reporting is turned off by default.
 
 ``ovfl_off.cfg`` This file turns off serial overflow reporting.
+
+
+``comp_on.cfg`` This file turns on the incompatible target image detection. The interface project must define a board specific `board_detect_incompatible_image()` function with the criteria to validate the target image over the first 12 vectors. Otherwise, the incompatible target image detection won't have an effect.
+
+``comp_off.cfg`` This file turns off the incompatible target image detection (off by default).

source/daplink/drag-n-drop/vfs_user.c

@@ -506,6 +506,9 @@ static uint32_t update_details_txt_file(uint8_t *data, uint32_t datasize)
     pos += util_write_string(buf + pos, "Overflow detection: ");
     pos += util_write_string(buf + pos, config_get_overflow_detect() ? "1" : "0");
     pos += util_write_string(buf + pos, "\r\n");
+    pos += util_write_string(buf + pos, "Incompatible image detection: ");
+    pos += util_write_string(buf + pos, config_get_detect_incompatible_target() ? "1" : "0");
+    pos += util_write_string(buf + pos, "\r\n");
     pos += util_write_string(buf + pos, "Page erasing: ");
     pos += util_write_string(buf + pos, config_ram_get_page_erase() ? "1" : "0");
     pos += util_write_string(buf + pos, "\r\n");