[U-Boot] Bad CPU identification on MPC8544DS

[U-Boot] Bad CPU identification on MPC8544DS

[jeff angielski]

Despite the SVR being the same (0x803c0011), the latest u-boot is
misidentifying the CPU when compared against the original 1.3.0 u-boot.
The CPU is a 8544E but u-boot is reporting 8533E.

The wierd part of this is that according to the Chip Errata for the
MPC8544E, the SVR *should* be 0x803c01xx  - which is different than both
the 1.3 and latest git version are reading.

Can any of the Freescale guys explain this discrepancy between the
manual, the Freescale BSP u-boot, and the latest u-boot?



Using the u-boot that is built with the LTIB and ships with the
MPC8544DS board:



U-Boot 1.3.0-rc3 (Mar 28 2008 - 11:13:50)

CPU:   8544_E, Version: 1.1, (0x803c0011)
Core:  E500, Version: 2.2, (0x80210022)  
Clock Configuration:                     
       CPU: 999 MHz, CCB: 399 MHz,       
       DDR: 199 MHz, LBC:  24 MHz        
L1:    D-cache 32 kB enabled             
       I-cache 32 kB enabled             



Using the latest u-boot:


U-Boot 2009.03-rc1-00031-gd82fd0f-dirty (Mar 03 2009 - 13:09:00)

CPU:   8533E, Version: 1.1, (0x803c0011)
Core:  E500, Version: 2.2, (0x80210022) 
Clock Configuration:                    
       CPU0:1000 MHz,                   
       CCB:400  MHz,                    
       DDR:200  MHz (400 MT/s data rate), LBC:25   MHz
L1:    D-cache 32 kB enabled                          
       I-cache 32 kB enabled                          
Board: MPC8544DS, System ID: 0x12, System Version: 0x20, FPGA Version:
0x31




-- 
Jeff Angielski
The PTR Group
www.theptrgroup.com

[U-Boot] Bad CPU identification on MPC8544DS

[Pieter]

jeff angielski wrote:
> Despite the SVR being the same (0x803c0011), the latest u-boot is
> misidentifying the CPU when compared against the original 1.3.0 u-boot.
> The CPU is a 8544E but u-boot is reporting 8533E.
>
> The wierd part of this is that according to the Chip Errata for the
> MPC8544E, the SVR *should* be 0x803c01xx  - which is different than both
> the 1.3 and latest git version are reading.
>
> Can any of the Freescale guys explain this discrepancy between the
> manual, the Freescale BSP u-boot, and the latest u-boot?
>
>
>
> Using the u-boot that is built with the LTIB and ships with the
> MPC8544DS board:
>
>
>
> U-Boot 1.3.0-rc3 (Mar 28 2008 - 11:13:50)
>
> CPU:   8544_E, Version: 1.1, (0x803c0011)
> Core:  E500, Version: 2.2, (0x80210022)  
> Clock Configuration:                     
>        CPU: 999 MHz, CCB: 399 MHz,       
>        DDR: 199 MHz, LBC:  24 MHz        
> L1:    D-cache 32 kB enabled             
>        I-cache 32 kB enabled             
>
>
>
> Using the latest u-boot:
>
>
> U-Boot 2009.03-rc1-00031-gd82fd0f-dirty (Mar 03 2009 - 13:09:00)
>
> CPU:   8533E, Version: 1.1, (0x803c0011)
> Core:  E500, Version: 2.2, (0x80210022) 
> Clock Configuration:                    
>        CPU0:1000 MHz,                   
>        CCB:400  MHz,                    
>        DDR:200  MHz (400 MT/s data rate), LBC:25   MHz
> L1:    D-cache 32 kB enabled                          
>        I-cache 32 kB enabled                          
> Board: MPC8544DS, System ID: 0x12, System Version: 0x20, FPGA Version:
> 0x31
>   
I found that U-boot 2009 does  much more detailed checking regarding the
CPU IDs. But also found discrepancies in the CPU reporting while running
U-boot 2009 using the BDI 2000. With the BDI2000 my CPU was detected as
8547E and with a standalone boot, U-Boot got 8548E.

See if the CPU is detected incorrectly while booting stand alone.
cheers pieter
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[U-Boot] Bad CPU identification on MPC8544DS

[jeff angielski]

On Tue, 2009-03-03 at 14:04 -0500, jeff angielski wrote:
> Despite the SVR being the same (0x803c0011), the latest u-boot is
> misidentifying the CPU when compared against the original 1.3.0 u-boot.
> The CPU is a 8544E but u-boot is reporting 8533E.
> 
> The wierd part of this is that according to the Chip Errata for the
> MPC8544E, the SVR *should* be 0x803c01xx  - which is different than both
> the 1.3 and latest git version are reading.
> 
> Can any of the Freescale guys explain this discrepancy between the
> manual, the Freescale BSP u-boot, and the latest u-boot?

The problem has been resolved.

It would appear that two forces were at work.  The older u-boot only
looked at 16 bits when determining the CPU type and could incorrectly
identify the various MPC85xx CPUs.  The second issue was that the
MPC8544DS hardware was being deployed with incorrect jumper settings.
These jumpers relate to the CPU ID.  Manufacturing never picked up on
this error because of the first problem.

So the latest u-boot is correct.



-- 
Jeff Angielski
The PTR Group
www.theptrgroup.com