Sources for the modified bootloader available?

joerg-krause commented 8 years ago

Are the sources to the modified bootloader for the JN5168 available?

Is the binary also valid for the JN5169?

simonduq commented 8 years ago

Hello, Unfortunately NXP is in not a position to release the source code. The binary does work for JN5169 yes. Thanks, Simon

joerg-krause commented 8 years ago

Hi @simonduq, so who did the modification to the bootloader and how?

simonduq commented 8 years ago

NXP's @NxpChrisGray did. Chris, comments welcome here :) Thanks

NxpChrisGray commented 8 years ago

Hello @joerg-krause,

Yes, as part of the NXP software team behind the JN51xx I was involved in the original boot loader development and the modifications, and I tested that it works on the JN5169 as well. Two caveats when using it on the JN5169:

The standard JN5169 boot loader includes a workaround for a small reset issue with the analogue peripherals, but this workaround is not in the modified boot loader. Instead, add this to the start-up code in your JN5169 application:
```
#include “PeripheralRegs.h”

u32RegisterValue = u32REG_SysRead(REG_SYS_PWR_CTRL);
vREG_SysWrite(REG_SYS_PWR_CTRL, u32RegisterValue | REG_SYSCTRL_PWRCTRL_APEN_MASK);
vREG_SysWrite(REG_SYS_PWR_CTRL, u32RegisterValue); 
```
The flash remapping feature in the JN516x, which is provided to support switching to a new application that has been sent to the device using an over-the-air update, will only work over the first 256kB of flash. As the reason for using the modified boot loader is to program new code into the device directly, and the default leaves the full 512kB available for this, this restriction should be immaterial

joerg-krause commented 8 years ago

Hi @NxpChrisGray,

many thanks for clarification! Any recommendations for howto flash the bootloader?

simonduq / simonduq.github.io

Sources for the modified bootloader available? #2