GitHub-Mirror/u-boot
2
0
Fork 0
mirror of https://github.com/Fishwaldo/u-boot.git synced 2025-07-03 04:42:40 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

powerpc/mpc8xxx: Add DDR2 to unified DDR driver

Browse source 
DDR2 has different ODT table and values. Adding table according to Samsung
application note.

Fix additive latency calculation to avoid interger underflow.

Also converted typedef dynamic_odt_t to struct dynamic_odt.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
York Sun 2011-08-26 11:32:43 -07:00 • committed by Kumar Gala
parent 905acde21a
commit 4e57382faa
4 changed files with 287 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

52
doc/README.fsl-ddr
View file

@ -170,3 +170,55 @@ Single slot system
Reference http://www.xrosstalkmag.com/mag_issues/xrosstalk_oct08_final.pdf
http://download.micron.com/pdf/technotes/ddr3/tn4108_ddr3_design_guide.pdf
Table for ODT for DDR2
======================
Two slots system
+-----------------------+----------+---------------+-----------------------------+-----------------------------+
| Configuration | |DRAM controller| Slot 1 | Slot 2 |
+-----------+-----------+----------+-------+-------+--------------+--------------+--------------+--------------+
| | | | | | Rank 1 | Rank 2 | Rank 1 | Rank 2 |
+ Slot 1 | Slot 2 |Write/Read| Write | Read |-------+------+-------+------+-------+------+-------+------+
| | | | | | Write | Read | Write | Read | Write | Read | Write | Read |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 1 | off | 150 | off | off | off | off | 75 | 75 | off | off |
| Dual Rank | Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 2 | off | 150 | 75 | 75 | off | off | off | off | off | off |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 1 | off | 150 | off | off | off | off | 75 | 75 | | |
| Dual Rank |Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 2 | off | 150 | 75 | 75 | off | off | off | off | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 1 | off | 150 | off | off | | | 75 | 75 | off | off |
|Single Rank| Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 2 | off | 150 | 75 | 75 | | | off | off | off | off |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 1 | off | 150 | off | off | | | 75 | 75 | | |
|Single Rank|Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 2 | off | 150 | 75 | 75 | | | off | off | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| Dual Rank | Empty | Slot 1 | off | 75 | 150 | off | off | off | | | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| Empty | Dual Rank | Slot 2 | off | 75 | | | | | 150 | off | off | off |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
|Single Rank| Empty | Slot 1 | off | 75 | 150 | off | | | | | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| Empty |Single Rank| Slot 2 | off | 75 | | | | | 150 | off | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
Single slot system
+-------------+------------+---------------+-----------------------------+
| | |DRAM controller| Rank 1 | Rank 2 |
|Configuration| Write/Read |-------+-------+-------+------+-------+------+
| | | Write | Read | Write | Read | Write | Read |
+-------------+------------+-------+-------+-------+------+-------+------+
| | R1 | off | 75 | 150 | off | off | off |
| Dual Rank |------------+-------+-------+-------+------+-------+------+
| | R2 | off | 75 | 150 | off | off | off |
+-------------+------------+-------+-------+-------+------+-------+------+
| Single Rank | R1 | off | 75 | 150 | off |
+-------------+------------+-------+-------+-------+------+
Reference http://www.samsung.com/global/business/semiconductor/products/dram/downloads/applicationnote/ddr2_odt_control_200603.pdf