Hi,
- Can IBAT and DBAT be modified dynamically? For example, if I want to
access 0x70000000 ~ 0x78000000 temporarily, which is not defined in configuration header file, can I change the configuration of one of IBAT and DBAT pair, e.g. ibat2 and dbat2?
In case of board/etin/debris board. DBAT1/IBAT1 is used for cache before RAM is initialized. After RAM is initialized and the data memory area is mapped to RAM, DBAT1/IBAT1 is not needed. So I use DBAT1 for a flash memory at 0x78000000 after it. See board/etin/debris/flash.c. You can find the following code in flash_init function.
msr = get_msr(); set_msr(msr & ~(MSR_IR | MSR_DR)); mtibat1l(0x70000000 | BATL_PP_10 | BATL_CACHEINHIBIT); mtibat1u(0x70000000 | BATU_BL_256M | BATU_VS | BATU_VP); mtdbat1l(0x70000000 | BATL_PP_10 | BATL_CACHEINHIBIT); mtdbat1u(0x70000000 | BATU_BL_256M | BATU_VS | BATU_VP); set_msr(msr);
You can also change IBAT1 with similar method.
Regards, Sangmoon Kim