[U-Boot] 405EP U-boot/Linux Question (CFG_OCM_DATA_ADDR)

[U-Boot] 405EP U-boot/Linux Question (CFG_OCM_DATA_ADDR)

[Pawel Pastuszak]

Hi guys,

I was wondering if some one could give me an hand with OCM for PPC405EP

So my goal is to Access *CFG_BOOTCOUNT_ADDR *value in Linux based on
http://www.denx.de/wiki/view/DULG/UBootBootCountLimit

In u-boot it works fine but ... but how to i talk to this memory range in
linux.

I tried the following but no luck.
    ulong * save_addr = ioremap( (CFG_OCM_DATA_ADDR + CFG_BOOTCOUNT_ADDR),8
);

    if (save_addr[1] != BOOTCOUNT_MAGIC)
        return 0;
    else
        return save_addr[0];


u-boot config file setting:
#define *CFG_OCM_DATA_ADDR*   0xF8000000
#define CFG_OCM_DATA_SIZE   0x1000
#define CFG_INIT_RAM_ADDR   CFG_OCM_DATA_ADDR /* inside of OCM      */
#define CFG_INIT_RAM_END    CFG_OCM_DATA_SIZE /* End of used area in RAM
*/

#define CFG_GBL_DATA_SIZE   128  /* size in bytes reserved for initial data
*/
#define CFG_GBL_DATA_OFFSET (CFG_INIT_RAM_END - CFG_GBL_DATA_SIZE)
/* reserve some memory for POST and BOOT limit info */
#define CFG_INIT_SP_OFFSET  (CFG_GBL_DATA_OFFSET - 24)

/* extra data in OCM */
#define CFG_POST_WORD_ADDR  (CFG_GBL_DATA_OFFSET - 4)
#define CFG_POST_MAGIC      (CFG_OCM_DATA_ADDR + CFG_GBL_DATA_OFFSET - 8)
#define CFG_POST_VAL        (CFG_OCM_DATA_ADDR + CFG_GBL_DATA_OFFSET - 12)

#ifdef CONFIG_BOOTCOUNT_LIMIT /* reserve 2 word for bootcount limit */
#define CFG_BOOTCOUNT_ADDR (CFG_GBL_DATA_OFFSET - 24)
//#define *CFG_BOOTCOUNT_ADDR* (CFG_OCM_DATA_ADDR + CFG_GBL_DATA_OFFSET -
16)
#endif

Any suggestion?

[U-Boot] 405EP U-boot/Linux Question (CFG_OCM_DATA_ADDR)

[Stefan Roese]

On Wednesday 28 January 2009, Pawel Pastuszak wrote:
> I was wondering if some one could give me an hand with OCM for PPC405EP
>
> So my goal is to Access *CFG_BOOTCOUNT_ADDR *value in Linux based on
> http://www.denx.de/wiki/view/DULG/UBootBootCountLimit

Please note that its CONFIG_SYS_BOOTCOUNT_ADDR now. 

> In u-boot it works fine but ... but how to i talk to this memory range in
> linux.
>
> I tried the following but no luck.
>     ulong * save_addr = ioremap( (CFG_OCM_DATA_ADDR + CFG_BOOTCOUNT_ADDR),8
> );
>
>     if (save_addr[1] != BOOTCOUNT_MAGIC)
>         return 0;
>     else
>         return save_addr[0];

And what's the result of the above code? Do you get an exception? Or some 
unreasonable values?

Which kernel version are you using?

Best regards,
Stefan

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