Охладить, его бы, наверное, стоило.
The on-die BROM code will try several methods to load and execute the firmware.
On a typical board like the Pine64 this will result in the following boot order:
1) Reading 32KB from sector 16 (@8K) of the microSD card to SRAM A1. If the
BROM finds the magic "eGON" header in the first bytes, it will execute that
code. If not (no SD card at all or invalid magic), it will:
2) Try to read 32KB from sector 16 (@8K) of memory connected to the MMC2
controller, typically an on-board eMMC chip. If there is no eMMC or it does
not contain a valid boot header, it will:
3) Initialize the SPI0 controller and try to access a NOR flash connected to
it (using the CS0 pin). If a flash chip is found, the BROM will load the
first 32KB (from offset 0) into SRAM A1. Now it checks for the magic eGON
header and checksum and will execute the code upon finding it. If not, it will:
4) Initialize the USB OTG controller and will wait for a host to connect to
it, speaking the Allwinner proprietary (but deciphered) "FEL" USB protocol.