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+--- Thread: Reserving memory for bootloader (/showthread.php?tid=22011)
Reserving memory for bootloader - mah115 - 2018-06-11
Hi,
I have a project where I'm using Microchip's Flash EEPROM emulation library to store non-volatile data, (similar situation as in this post: https://picbootloader.com/forum/showthread.php?tid=187&highlight=an+1095).
I want to explicitly place the non-volatile memory because the EEPROM library will have an error if it tries to initialize a memory block that already has other unerased data in it from a different program. However, when I do this, the linker starts putting code in the memory areas where the bootloader would go. I tried to work around this by reserving a block of memory, but when I load the code I get stuck in the AddressError trap.
Code:
unsigned char BL_placeholder[1024]
__attribute__((space(prob), aligned(1024),address(0x00A400), noload));I'm using a PIC24FJ64GB106 and the C30 compiler. If I understand this correctly, the bootloader would be placed at address 0xA400, this seems to be the case from looking at the memory map of the ds30 build.
I don't understand why I'm getting an addressing error after loading the program, any help is appreciated. Thanks!
RE: Reserving memory for bootloader - Mikael Gustavsson - 2018-10-28
Hi,
Try something like this
Code:
const unsigned int__attribute__((space(prog),address(0x...))) a = 0x1234;