Hi ,
I am using a custom board(VPX Based P2020 board) and try to port latest uboot in it . The board is similar to xpedite550x board and the technical specification is shown below
->Processor
Freescale QorIQ P2020 processor Dual PowerPC e500v2 cores at up to 1.2 GHz 512 kB of shared L2 cache
->Memory
1 GB of DDR3-600 SDRAM 128 MB of NOR flash (16-bit)
Through Codewarroier Emulator Tool, We checked the DDR,FLASH,Uart console and its working fine without any issue.
when we port the latest u-boot (u-boot-2012.07), it fails at _start_cont (start.S) and cannot get serial console .We took reference of xpedite550x board file and made similar changes to our customized board file. We even installed a patch in start.s file with reference to this website http://patchwork.ozlabs.org/patch/172742/ but still the problem persist.
Please clear the following issues
1. first start.S failed at Terminate call chain line so only we applied above patch for stack pointer alignment.. Is the patch need to be applied ? 2. After applying the patch , start.S fails at initial entry to cpu_early_init_f. Is there any stack problem
Because of this we are not getting any characters in COM console. But we probed the flash CS while poweron boot , processor is keeping bunch of CS( confirms processor able to access flash)
Attached objdump of our u-boot. In the dump it is failing at fff8004c
fff8004c: 48 00 00 05 bl fff80050 <_start_cont+0x20> fff80050: 7d 88 02 a6 mflr r12
Help us to solve the issue
With regards,
Vidya