https://devzone.nordicsemi.com/f/nordic-q-a/11531/51822ab-can-t-runI use softdevice 6.00, size is 80K Byte. I use the chip NRF51822ab,and configurat the irom start at 0x14000,size 0xC000, IRAM, start at 0x20002000,size is 0x2000 ,in keil. both the softdevice S110 and app ble_app_hrs are downloaded the chip successfullyen-USTelligent Community 13Thu, 28 Jan 2016 14:00:51 GMThttps://devzone.nordicsemi.com/thread/43592?ContentTypeID=1Thu, 28 Jan 2016 14:00:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae0b0bec-20b5-4fdd-bee8-e1eb555f0a7amnxnm<p>Hi stefan, the problem is closed,the chip can&#39;t run not for the iRAM but for the clock,need change the LFCLK RC oscillator as the low clock source.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/43591?ContentTypeID=1Wed, 27 Jan 2016 15:23:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0fa7ce12-e2b4-4c36-b621-face0607967cStefan Birnir Sverrisson<p>Hi</p> <p>From my calculations, your IRAM and IROM settings are correct for the nRF51822 QFAB chip. Are you using second or third revision nRF51822 chip. According to the compatibility matrix, you should optimally be using second revision nRF51822 together with S110 6.0.0 and SDK 5.2.0. What chip revision are you having?</p> <p>The size of the heart rate example in SDK 5.2.0 is about 21kB, so the total size of softdevice and heart rate application is 80kB+21kB=101kB which should be fine for the 128kB flash of the nRF51822 QFAB chip.</p> <p>If you start a debugger, where does the code execution stop?</p> <p>Are you having a custom board? If so, does the blinky work?</p><div style="clear:both;"></div>