On Thursday 23 February 2012 15:49:02 Marek Vasut wrote:
My experience is mostly SPEAr600 only right now. Not sure if there are bigger differences between those SoC's in the BootROM.
I believe the spear600 is totally different from 1300. But, simple:
reset halt ; load ... ; go ...
combo should work I believe. In case you're loading some U-Boot SPL, it's very good idea to put an "asm volatile("x : b x");" line into the SPL to make the CPU loop instead of try loading uboot. Since if the CPU is looping, you can break it with BDI, if it isn't looping and jumps to some garbage, it usually ends in undefined state and bootrom might further tamper with the CPU configuration.
Yes, good point. But a "STARTUP RESET ;no code is executed after reset" seems to solve this problem as well. At least for me on SPEAr600. I know. Since I broke my SPL from time to time. ;)
Ah that's good idea indeed, though sometimes you might want to break the execution after the BootROM, since bootrom might be doing some mandatory chip init.
M
Best regards, Stefan
-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office@denx.de