Hello everybody! As some of you may already know, we're working on the TMS570 BSP. According to the board's datasheet we need to initialize the CPU's registers at startup:
"The TMS570LS series of microcontrollers include dual Cortex-R4F CPUs running in a lock-step operation mode. A Core Compare Module (CCM-R4) compares the output signals from each R4F CPU. Any difference in the two CPUs outputs is flagged as a fault of a high severity level. The CPU internal core registers need to be initialized to a predefined state in order to prevent an error from being flagged during system initialization." Ideally, we would do this in _start right before initializing the stack pointer registers. However, this would be wrong as start.S is shared by all the ARM BSPs. Right now we're doing it at the beginning of bsp_start, but it would be safer to do it at the beginning of _start. Additionally, when the CCM detects an error it raises a FIQ which must be handled in a board-specific way, otherwise it re-raises the FIQ as soon as _ARMV4_Exception_fiq_default enables FIQs in the CPSR. Again, we don't want to mix our BSP-specific things with the shared ARM code. How should we go about this? Thanks a lot! -- Martín Galván Software Engineer Taller Technologies Argentina San Lorenzo 47, 3rd Floor, Office 5 Córdoba, Argentina Phone: 54 351 4217888 / +54 351 4218211 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
