[U-Boot] NAND on mpc8360erdk

[U-Boot] NAND on mpc8360erdk

[Renaud barbier]

I am in the middle of NAND debugging on a MPC8544 based system.
 
In the following code for the mpc8360erdk, why is there
the instruction "out_8(upm->io_addr, 0x0);" in the for loop.
Is that board specific?

static void upm_setup(struct fsl_upm *upm)
{
    int i;

    /* write upm array */
    out_be32(upm->mxmr, MxMR_OP_WARR);

    for (i = 0; i < 64; i++) {
        out_be32(upm->mdr, upm_array[i]);
        out_8(upm->io_addr, 0x0);
    }

    /* normal operation */
    out_be32(upm->mxmr, MxMR_OP_NORM);
    while (in_be32(upm->mxmr) != MxMR_OP_NORM)
        eieio();
}

[U-Boot] NAND on mpc8360erdk

[Anatolij Gustschin]

Hi,

Renaud barbier wrote:
> I am in the middle of NAND debugging on a MPC8544 based system.
>  
> In the following code for the mpc8360erdk, why is there
> the instruction "out_8(upm->io_addr, 0x0);" in the for loop.

it is a dummy write transaction step of the UPM RAM array
programming algorithm to hit the relevant chip select.
Take a look at section '10.4.4.2 Programming the UPMs' of the
MPC8360E Reference Manual, the steps to write the UPM RAM
array are described there.

> Is that board specific?

No.

Anatolij

[U-Boot] NAND on mpc8360erdk

[Wolfgang Grandegger]

Renaud barbier wrote:
> I am in the middle of NAND debugging on a MPC8544 based system.

BTW: also the TQM8548 module uses FSL UPM NAND.

Wolfgang.

[U-Boot] NAND on mpc8360erdk

[Renaud barbier]

Thanks. I supposed the NAND on the TQM8548 is connected to the CPU as 
per Freescale Application Note.


Wolfgang Grandegger wrote:
> Renaud barbier wrote:
>   
>> I am in the middle of NAND debugging on a MPC8544 based system.
>>     
>
> BTW: also the TQM8548 module uses FSL UPM NAND.
>
> Wolfgang.
>