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Merge branch 'findhashes' of git://github.com/martinwork/microbit-dal into dal-integration

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This commit is contained in:
Joe Finney 2018-09-05 10:24:08 +01:00
commit 0d86640b80
1 changed files with 14 additions and 20 deletions
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34
source/drivers/MicroBitMemoryMap.cpp
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@ -112,29 +112,23 @@ int MicroBitMemoryMap::updateRegion(Region region)
void MicroBitMemoryMap::findHashes()
{
// Iterate through pages to find magic
for(uint8_t x = 0; x < NRF_FICR->CODESIZE - 1; x++)
uint32_t add = FLASH_PROGRAM_END;
uint32_t rem = add % PAGE_SIZE;
if ( rem) add += PAGE_SIZE - rem;
int step = PAGE_SIZE / sizeof( uint32_t);
uint32_t *nxt = ( uint32_t *)DEFAULT_SCRATCH_PAGE;
for( uint32_t *magicAddress = (uint32_t *) add; magicAddress < nxt; magicAddress += step)
{
uint32_t volatile *magicAddress = (uint32_t *)(0x400 * x);
// Check for first 32 bits of Magic
// memcmp(magicAddress, magic, 16);
if(*magicAddress == 0x923b8e70 &&
*(uint32_t *)(magicAddress + 0x1) == 0x41A815C6 &&
*(uint32_t *)(magicAddress + 0x2) == 0xC96698C4 &&
*(uint32_t *)(magicAddress + 0x3) == 0x9751EE75
){
// Check for 16 bytes of Magic
if ( magicAddress[0] == 0x923b8e70
&& magicAddress[1] == 0x41A815C6
&& magicAddress[2] == 0xC96698C4
&& magicAddress[3] == 0x9751EE75) {
// If the magic has been found use the hashes follow
magicAddress = (uint32_t *)(magicAddress + 0x4);
memcpy(memoryMapStore.memoryMap[1].hash, (uint8_t *)magicAddress, 8);
magicAddress = (uint32_t *)(magicAddress + 0x2);
memcpy(memoryMapStore.memoryMap[2].hash, (uint8_t *)magicAddress, 8);
memcpy( memoryMapStore.memoryMap[1].hash, magicAddress + 4, 8);
memcpy( memoryMapStore.memoryMap[2].hash, magicAddress + 6, 8);
memoryMapStore.memoryMap[2].startAddress = (uint32_t)magicAddress;
return;
}
}
}