Why would app_timer_start fail for the bootloader?

Question

In the code for the bootloader in dfu_dual_bank.c and the function dfu_init , I currently get an error code on timer start: 4 ( NRF_ERROR_NO_MEM ). 
 err_code = app_timer_start(m_dfu_timer_id, DFU_TIMEOUT_INTERVAL, NULL); 
if (err_code != NRF_SUCCESS) 
 nrf_gpio_pin_set(PIN_LED6); 
 
 What might be the reason that app_timer_start would fail to work for the bootloader? From the code I can only see it being call in dfu_init and dfu_timer_restart . The latter function is not called, so can't be the culprit. 
 Do I need to do specific things to keep memory usage low for the bootloader?

Anne van Rossum · Accepted Answer

The answer is that, indeed, for the S130 the Nordic bootloader does not work without adjustments to limit memory usage. 
 The following fork contains all changes that are required to do so: github.com/.../nrf51-dfu-bootloader-for-gcc-compiler