u-boot DCD table different between version 2014.10 and 2009.08

[wallyyeh]

Hi, guys:

   I'm not an expert so I can't figure out what is the magic in u-boot DCD table.

only I know is following this guide below, it tells me , just filling the excel and copy-past the value from the excel to my DCD table.

   i.Mx6DQSDL DDR3 Script Aid

    Now it seems a bit old, because 2014.10 u-boot writes 101 DCD items while 2009.08 u-boot just writes 83 items.

so I can't find how to match these DCD item not generated by i.Mx6DQSDL DDR3 Script Aid.

    For example, 2009.08 u-boot write address 0x021b001c 7 times, once for "MMDC init", and 6 times for "Mode register writes".

2014.10 u-boot write 0x021b001c for 11 times, once for "MMDC init", and 10 times for "Mode register writes", I guess.

    and 2014.10 u-boot also write address which not include in 2009.08 version:

    * 0x020e0590 -> Unknown usage, the value is the same as 2009.08 default value.

    * 0x020e0598 -> Unknown usage, the value is the same as 2009.08 default value.

    * 0x021b4800 -> Unknown usage.

    * 0x020c4068 -> set the default clock gate to save power

    * 0x020c406c -> set the default clock gate to save power

    * 0x020c4070 -> set the default clock gate to save power

    * 0x020c4074 -> set the default clock gate to save power

    * 0x020c4078 -> set the default clock gate to save power

    * 0x020c407c -> set the default clock gate to save power

    * 0x020c4080 -> set the default clock gate to save power

    * 0x020e0010 -> enable AXI cache for VDOA/VPU/IPU

    * 0x020e0018 -> set IPU AXI-id0 Qos=0xf(bypass) AXI-id1 Qos=0x7

    * 0x020e001c -> set IPU AXI-id0 Qos=0xf(bypass) AXI-id1 Qos=0x7

    * 0x020c4060 -> sets CCM_CCOSR register "CKO1" at ahb_clk_root/8 = 132/8 = 16.5 MHz

    Does some body know how to match 2009.08 u-boot DCD items to 2014.10 u-boot correctly?

any suggestion will be appreciated, thanks.

Wally

[igorpadykov · Accepted solution]

Hi Wally

uboot 2014 is quite different from 2009.08, as it uses

device tree concept (UBootFdtInfo < U-Boot < DENX).

Seems there is no need to modify uboot 2009.08 DCD items,

as actually differencies which you mentioned are contained

in another uboot 2009.08 file: lowlevel_init.S.

Best regards

igor

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[wallyyeh]

Hi, igorpadykov:

    Thanks for your answer. :smileygrin: that's really help. my boss choose different DDR Ram to cost down the product.

so I need to replace the DTD items to get correct DDR timing.

I take a look for u-boot-2009.08/board/freescale/mx6q_sabresd/lowlevel_init.S.

now is what I found:

   2014.10 u-boot                                       2009.08

* 0x020c4068 -> 0x00C03F3F              * 0x020c4068 -> 0x00C0003F     different value

* 0x020c406c -> 0x0030FC03              * 0x020c406c -> 0x0030FC00     different value

* 0x020c4070 -> 0x0FFFC000             * 0x020c4070 -> 0x0FFFC000    matched

* 0x020c4074 -> 0x3FF00000             * 0x020c4074 -> 0x3FF00000    matched

* 0x020c4078 -> 0x00FFF300             * 0x020c4078 -> 0x00FFF300    matched

* 0x020c407c -> 0x0F0000C3             * 0x020c407c -> 0x0F0000C3    matched

* 0x020c4080 -> 0x000003FF             * 0x020c4080 -> 0x000003FC    different value

* 0x020c4060 -> 0x000000FB              * 0x020c4060 -> 0x000A0001    2014.10 seems enable CKO1.

only one thing now I can't match:

* 0x021b001c -> 0x04088032              * 0x021b001c -> 0x04088032    matched

* 0x021b001c -> 0x0408803A              * where is it ?

* 0x021b001c -> 0x00008033              * 0x021b001c -> 0x00008033    matched

* 0x021b001c -> 0x0000803B              * where is it ?

* 0x021b001c -> 0x00428031              * 0x021b001c -> 0x00048031    matched

* 0x021b001c -> 0x00428039              * where is it ?

* 0x021b001c -> 0x19308030              * 0x021b001c -> 0x09408030    different value

* 0x021b001c -> 0x19308038              * where is it ?

* 0x021b001c -> 0x04008040              * 0x021b001c -> 0x04008040    matched

* 0x021b001c -> 0x04008048              * where is it ?

there is 0x021B0004 should set to 0x00025576 after setting above 0x021b001c register. but can't find it on 2014.10 u-boot.

could you help me with these 5 register value (mark as * where is it ? ).

Wally

[wallyyeh]

Sorry,   i.Mx6DQSDL DDR3 Script Aid already generate 10 times of 0x021b001c.

5 times for MMDC CS0 and 5 times for CS1.

2009.08 only write DCD items for CS0.