Not able to boot cuImage for the target board with MPC8270 processor

[Christophe LEROY]

Le 29/08/2018 à 13:14, sgosavi1 a écrit :
> Hi Everyone,
> 
> Recently I took up the activity of switching from Linux kernel version
> 2.16.17.6 to version 4.15.13 for our target board that supports MPC8270
> PowerPC  processor. As I understand the new kernel version mandates the use
> of a device tree in the kernel source to describe the target board. I took
> "pq2fads.dts" as a reference device tree file to port the kernel for our
> target board. The U-boot version 1.1.4 that we currently use does not
> support passing of device tree to kernel but passes the board information
> structure used by the older kernel version we have been using so far.
> 
> As suggested in the new kernel documentation I created a "cuImage.pq2fads"
> kernel image which has the device tree and boot wrapper code embedded in the
> image to support booting the kernel with older U-boot. However I am unable
> to see any debug output after the dump from U-boot below.
> 
> U-Boot 1.1.4 (Aug  2 2018 - 06:27:35)
> 
> MPC8260 Reset Status: Check Stop, External Soft, External Hard
> 
> MPC8260 Clock Configuration
>   - Bus-to-Core Mult 4x, VCO Div 2, 60x Bus Freq  25-75 , Core Freq 100-300
>   - dfbrg 1, corecnf 0x1a, busdf 5, cpmdf 1, plldf 0, pllmf 5
>   - vco_out  394515000, scc_clk   98628750, brg_clk   24657187
>   - cpu_clk  263010000, cpm_clk  197257500, bus_clk   65752500
> 
> CPU:   MPC8260 (HiP7 Rev 14, Mask 1.0 1K49M) at 263.010 MHz
> Board: Emerson MPC8270 CCB
> Init SRAM, CAN, DOC...
> UPMA done. Setting up UPMB
> Rev B or Higher CPU Board
> I2C:   ready
> DRAM:  128 MB
> FLASH: 16 MB
> In:    serial
> Out:   serial
> Err:   serial
> Net:   FCC1 ETHERNET, FCC2 ETHERNET
> Press <foo> to STOP AUTOBOOT!:autoboot in 2 seconds
> ## Booting image at ffc00000 ...
>     Image Name:   Linux-4.15.13
>     Created:      2018-08-29  10:45:39 UTC
>     Image Type:   PowerPC Linux Kernel Image (gzip compressed)
>     Data Size:    1166748 Bytes =  1.1 MB
>     Load Address: 00400000
>     Entry Point:  004007a4
>     Verifying Checksum ... OK
>     Uncompressing Kernel Image ... OK
> 
> 
> I also checked the kernel dump at location associated with "_log_buf" symbol
> in the System.map file in RAM but did not get any debug info.
> 
> Please can anyone suggest if I am missing something here and how can I get
> the debug output on my serial console during bootup.

Have you selected CONFIG_PPC_EARLY_DEBUG (and probably 
CONFIG_PPC_EARLY_DEBUG_CPM) ?

Christophe

> 
> Thanks,
> Sachin.
>   
> 
> 
> 
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>