Remove obsolete target. Cleanup and update ReadMe. (#279)

bootloader/ReadMe.md

@@ -3,20 +3,22 @@
 What it does?
 
 - [+] Hardware initialization
-- [ ] Firmware CRC check
-- [+] Firmware update
-- [ ] Interactive UI
 - [+] Boot process LED indicators
+- [+] Firmware update
+- [ ] Firmware CRC check
+- [ ] Interactive UI
 - [ ] FS check
 - [ ] Recovery mode
+- [ ] Errata crutches
 
 # Targets
 
-| Name      | Bootloader    | Firmware      | Reset | DFU           |
-|           | Address       | Address       | Combo | Combo         |
----------------------------------------------------------------------
-| f2        | 0x08000000    | 0x00008000    | L+R   | L+R, hold R   |
+| Name      | Bootloader    | Firmware      | Reset     | DFU               |
+|           | Address       | Address       | Combo     | Combo             |
+-----------------------------------------------------------------------------
+| f4        | 0x08000000    | 0x00008000    | L+Back    | L+Back, hold L    |
 
+Also there is a ST bootloader combo available on empty device: L+Ok+Back, release Back,Left.
 Target independend code and headers in `src`and `target/include` folders.
 
 # Building
@@ -27,21 +29,25 @@ Target independend code and headers in `src`and `target/include` folders.
 
 ## With toolchain installed in path:
 
-`make`
+`make -C bootloader `
 
 ## Build Options
 
 - `DEBUG` - 0/1 - enable or disable debug build. Default is 1.
-- `TARGET` - string - target to build. Default is `f2`.
+- `TARGET` - string - target to build. Default is `f4`.
 
 # Flashing 
 
 Using stlink(st-flash):
 
-`make flash`
+`make -C bootloader flash`
+
+Or use ST bootloader:
+
+`make -C bootloader upload`
 
 # Debug
 
 Using stlink (st-util + gdb):
 
-`make debug`
+`make -C bootloader  debug`