Updated with parallel run info

README.md

@@ -1,4 +1,4 @@
-# RAK811 breakout board
+ls# RAK811 breakout board
 
 Code from here 
 https://github.com/RAKWireless/RAK811_BreakBoard
@@ -69,6 +69,12 @@ Read more here [running in qemu](./QEMU.md)
 
 http://www.st.com/content/ccc/resource/technical/document/reference_manual/cc/f9/93/b2/f0/82/42/57/CD00240193.pdf/files/CD00240193.pdf/jcr:content/translations/en.CD00240193.pdf
 
+# Building with makefile,
+You can checkout the original files and use this makefile to build,
+https://raw.githubusercontent.com/oguiter/RAK811_BreakBoard/master/Makefile
+I did this and ran the generated elf files in qemu.
+Read more amout this experiment here,
+Read more here [running in parallell](./parallell_run.md)
 
 
 # Startup code

parallell_run.md

@@ -0,0 +1,49 @@
+# Parallell run
+
+Here I compare the software built by platformio compared to the Makefile build which should be more similar to the Original RAK source.
+
+
+clone https://github.com/RAKWireless/RAK811_BreakBoard
+cd RAK811_BreakBoard
+wget https://raw.githubusercontent.com/oguiter/RAK811_BreakBoard/master/Makefile
+make
+
+
+# Start qemu
+./qemu-system-arm  -S -s   -serial file:uart1.log  -d unimp  -monitor stdio -machine rak811  -cpu cortex-m3  -pflash Debug/classA.bin
+
+
+# Start debugger
+arm-none-eabi-gdb  Debug/classA.axf -ex ' target remote:1234'
+
+
+
+
+The biggest difference is that platformio has commented out the call to __libc_init_array, There also _init is called.
+
+
+bl     0x8012874 <_init>  
+
+
+Here is the code,
+
+
+
+
+
+0x80123dc <__libc_init_array>           push   {r4, r5, r6, lr}                                                                                       │
+   │0x80123de <__libc_init_array+2>         movs   r5, #0                                                                                                 │
+   │0x80123e0 <__libc_init_array+4>         ldr    r6, [pc, #48]   ; (0x8012414 <__libc_init_array+56>)                                                   │
+   │0x80123e2 <__libc_init_array+6>         ldr    r4, [pc, #52]   ; (0x8012418 <__libc_init_array+60>)                                                   │
+   │0x80123e4 <__libc_init_array+8>         subs   r4, r4, r6                                                                                             │
+   │0x80123e6 <__libc_init_array+10>        asrs   r4, r4, #2                                                                                             │
+   │0x80123e8 <__libc_init_array+12>        cmp    r5, r4                                                                                                 │
+   │0x80123ea <__libc_init_array+14>        bne.n  0x8012400 <__libc_init_array+36>                                                                       │
+   │0x80123ec <__libc_init_array+16>        bl     0x8012874 <_init>                                                                                      │
+   │0x80123f0 <__libc_init_array+20>        movs   r5, #0                                                                                                 │
+   │0x80123f2 <__libc_init_array+22>        ldr    r6, [pc, #40]   ; (0x801241c <__libc_init_array+64>)                                                   │
+   │0x80123f4 <__libc_init_array+24>        ldr    r4, [pc, #40]   ; (0x8012420 <__libc_init_array+68>)                                                   │
+   │0x80123f6 <__libc_init_array+26>        subs   r4, r4, r6                                                                                             │
+   │0x80123f8 <__libc_init_array+28>        asrs   r4, r4, #2                                                                                             │
+   │0x80123fa <__libc_init_array+30>        cmp    r5, r4
+