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Observer
Observer
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Registered: ‎09-02-2018

Can VCU DDR4 IP support 512Mb(x16) memory?

Hi, 

Can VCU DDR4 IP support 512Mb memory(x16)?

When I set the VCU DDR4 IP to support 512Mb memory(x16), mcu(al5d) will not start.

The error message as below:

[   11.535862] random: udevd: uninitialized urandom read (16 bytes read)

[   11.547071] udevd[1802]: starting eudev-3.2.5

[   11.591448] mali: loading out-of-tree module taints kernel.

[   11.638153] xilinx-mem2mem amba_pl@0:video_m2m: Created instance (____ptrval____), m2m_ctx: (____ptrval____)

[   11.848540] random: fast init done

[   11.895430] [drm] Cannot find any crtc or sizes

[   11.958137] xilinx-vcu xilinx-vcu: Could not get core_enc clock

[   11.964444] VCU PLL: enable

[   11.967127] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.

[   11.968096] xilinx-vcu xilinx-vcu: xvcu_probe: Probed successfully

[   11.999623] al5e a0100000.al5e: l2 prefetch size:18186240 (bits), l2 color bitdepth:10

[   17.211407] al5d a0120000.al5d: Mcu didn't start (no ping after startup, is mcu enabled ?)

[   17.359413] al5d a0120000.al5d: Failed to setup firmware

[   17.365570] al5d: probe of a0120000.al5d failed with error -22

 

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Moderator
Moderator
281 Views
Registered: ‎11-09-2015

Re: Can VCU DDR4 IP support 512Mb(x16) memory?

Hi @chlee.tw 

The support is limited to only few parts. As per PG252:

Component/SODIMM support for interface width of 64 bits

  • Supports speed bins of 2133, 2400, and 2667
  • Support for Component Memory for x8 (KVR21SE15S8/4), x16 (MT40A256M16GE-07), and SODIMM X8

Makev sure you use a supported part


Florent
Product Application Engineer - Xilinx Technical Support EMEA
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Xilinx Employee
Xilinx Employee
240 Views
Registered: ‎03-04-2018

Re: Can VCU DDR4 IP support 512Mb(x16) memory?

Hello @chlee.tw ,

 

As Florent mentioned, the supported memories are described in the PG252.  Please consider the use of it at first.

 

As for the memory part, if your memory is equal to the MT40A256M16GE-07(x16), it will be use.  But please carefully check the speed bin value for 2133, 2400 and 2667 if all value are the same.  Attached figure is an example of speed bin.

 

Best regards,

kshimizu

Product Application Engineer Xilinx Technical Support

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speed bin.PNG
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