Changes

Jump to navigation Jump to search
283 bytes added ,  08:13, 8 June 2019
no edit summary
===ARM7_CODE===
This region is an arm7 bootrom overlay, over the first vector table at address 0. Once the ARM7 is taken out of reset by <code>TwlProcess9</code that >, the reset vector will be run after jumped to, beginning execution begins. <code>TwlProcess9</code> uses this to put ARM7 in a loop (TWL), and to set the <code>POSTFLG</code> and branch to more copied code (GBA). This doesn't seem Execution is started by writing <code>0x8001</code> to start execution [[CONFIG11_Registers#CFG11_TWLMODE_0|CFG11_TWLMODE_0]]. Later, this overlay is disabled by itselfthe ARM7 via the "biosprot" register (0x04000308).
Reading uninitialized data in this 32-byte region leads to both screens displaying solid green (exception), and the CPU locking up.
35

edits

Navigation menu