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Line 105:
Line 105: − +
→Boot9 startup: name of register
0xffff0000 jumps to 0xffff8000. 0xffff8000 is crt0:
0xffff0000 jumps to 0xffff8000. 0xffff8000 is crt0:
* Very first thing this does is clear u8 register 0x10000002 bit0 to zero.
* Very first thing this does is clear u8 register 0x10000002 ([[CONFIG_Registers#CFG_RST11|CFG_RST11]]) bit 0 to zero.
* Then sp is initialized for each cpumode, IRQs/FIQs are disabled during the first mode-switch.
* Then sp is initialized for each cpumode, IRQs/FIQs are disabled during the first mode-switch.
* Order of mode-switches + sp initialization: svc-mode = 0xfff04000, irq-mode = 0xfff03f00, system-mode = 0xfff03b00. Hence, the rest of the code following this runs in system-mode.
* Order of mode-switches + sp initialization: svc-mode = 0xfff04000, irq-mode = 0xfff03f00, system-mode = 0xfff03b00. Hence, the rest of the code following this runs in system-mode.