Update softdevice in mbed kit

Question

Hi guys, 
 How to update softdevice on mBED nRF51882 kit? 
 Details:
I have couple mbed dev kits with nrf51882.
I use Keil for development but will move to GCC after while. 
 Because debugger is CMSIS-DAP I can't use nRF Studio to update softdevice.
So I used pyOCD and arm-none-eabi-gdb to flash s110_7.0.0. 
 And today I noticed strange thing... 
 If I flash softdevice by pyOCD:
arm-none-eabi-gdb s110_nrf51822_7.0.0_softdevice.hex -ex "target remote :3333" -ex "load" 
 and then upload Keil project over CMSIS-DAP it doesn't work and even doesn't start.
But if I merge s110_nrf51822_7.0.0_softdevice.hex and my application code it runs ok. 
 I have a feeling it that is because of wrong UICR configuration...
I'm quite confuse because I can't find any article or forum discussions about this issue.

Clem Taylor · Accepted Answer

pyOCD and the mbed-msd only does a full chip erase. It is much more convenient to just flash elf files in gdb, so I converted the softdevice hex file to binary and I compile it into the elf file. 
 In my .ld file: 
 MEMORY
{ 
 /* flash: 0x00000000 - 0x0003FFFF (256K) */
 /* sram: 0x20000000 - 0x20003FFF (16K) */

 /* S110 7.0.0 softdevice occupies top 88K of flash and 8K of SRAM */
 SD_FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x16000
 SD_RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x2000 
 
 /* application gets the rest of flash and sram */
 FLASH (rx) : ORIGIN = 0x00016000, LENGTH = 0x2A000
 RAM (rwx) : ORIGIN = 0x20002000, LENGTH = 0x2000
}
 
SECTIONS
{
 /* include the softdevice binary image: */
 .SOFTDEVICE :
 {
 KEEP(*(.softdevice))
 } > SD_FLASH = 0xFF
}
 
INCLUDE "gcc_nrf51_common.ld"
 
 softdevice.s: 
 /* Convert the binary softdevice into a linkable object. */
 .section .softdevice, "ax"
 .incbin "softdevice/s110_nrf51822_7.0.0_softdevice.bin"

Update softdevice in mbed kit

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