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  about 7 years ago by jdelvare | Reply

  This project has 2 different parts. The most obvious part is to add all the DDR4-specific register definitions to the decode-dimms script. But some work is also needed in the kernel, because the EEPROMs used to store the SPD information on DDR4 modules are non-standard. They are 512-byte EEPROMs but use only 1 I2C address for data access. You need to switch between lower page and upper page of data by sending commands on the SMBus. A dedicated driver seems appropriate.

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Edit Comment 2908
# A First Level Header
## A Second Level Header

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This project has 2 different parts. The most obvious part is to add all the DDR4-specific register definitions to the decode-dimms script. But some work is also needed in the kernel, because the EEPROMs used to store the SPD information on DDR4 modules are non-standard. They are 512-byte EEPROMs but use only 1 I2C address for data access. You need to switch between lower page and upper page of data by sending commands on the SMBus. A dedicated driver seems appropriate.
 
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Reply to jdelvare
This project has 2 different parts. The most obvious part is to add all the DDR4-specific register definitions to the decode-dimms script. But some work is also needed in the kernel, because the EEPROMs used to store the SPD information on DDR4 modules are non-standard. They are 512-byte EEPROMs but use only 1 I2C address for data access. You need to switch between lower page and upper page of data by sending commands on the SMBus. A dedicated driver seems appropriate.
---
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

- Use hyphens
- for unordereed
- lists

This is an [link to example.com](http://example.com/)

This is an image ![an openSUSE geeko icon](https://en.opensuse.org/images/d/d0/Icon-distribution.png)

This is a user link @hans

This is a project link hw#some-cool-title
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  about 7 years ago by jdelvare | Reply

  The project is a success.

  Sample output

  User-space patches

  Kernel driver

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Edit Comment 3036
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

- Use hyphens
- for unordereed
- lists

This is an [link to example.com](http://example.com/)

This is an image ![an openSUSE geeko icon](https://en.opensuse.org/images/d/d0/Icon-distribution.png)

This is a user link @hans

This is a project link hw#some-cool-title
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The project is a success. [Sample output](http://users.suse.com/~jdelvare/hackweek/0x10/decode-dimms-DDR4.html) [User-space patches](https://marc.info/?l=linux-i2c&m=151109479318246&w=2) [Kernel driver](https://lkml.org/lkml/2017/11/20/131)
 
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Reply to jdelvare
The project is a success.
Sample output
User-space patches
Kernel driver
---
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

- Use hyphens
- for unordereed
- lists

This is an [link to example.com](http://example.com/)

This is an image ![an openSUSE geeko icon](https://en.opensuse.org/images/d/d0/Icon-distribution.png)

This is a user link @hans

This is a project link hw#some-cool-title
More Complex Markdown Help
Formatting Help
• Edit
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