Kumar Gala wrote:
We are using MPC8555 processor and uboot 1.1.4 both the uboot and linux was up. Now we plan to port QNX, we are facing following issues.
- Qnx is not jumping to the startup location. After giving go
command control is still in the uboot only.
- When searching in the mailling list we came to know qnx required
to flush the Data Cache before disabling it in the uboot level (common/cmd_bootelf.c line no:59)
- I checked other powerpc architecture like 7xx/74xx, 86xx and 4xx.
These architecture has seperate cache.S file ( cpu/mpc86xx/ cache.S). That file contains flush_data_cache function to flush the cache before disabling it. But in the MPC85xx flushing the data cache was missing.
- This is a bug in the 85xx uboot code. Is there any work arround for
this?
1.1.4 is a fairly old u-boot at this point. I believe we have reworked the PPC cache ops and fixed the fact that 85xx was missing flush_data_cache in the process.
Not really, unfortunatelly: the 85xx still lacks flushing the d-cache before disabling it. I was going to fix this by refactoring existing d-cache disabling/flushing routines into a common code that would sit in the lib_ppc/ppccache.S (as mostly exisiting implementations are just copy/paste of the same thing) and have 85xx use it too, but didn't have time yet to clean it up. If anyone is willing to do it sooner, I won't complain :)
Rafal