Support old DDR3 training code on Turris Omnia, selectable via EEPROM
field.
Users experiencing DDR3 initialization failures or random crashes of the
operating system due to incorrect DDR3 configuration can select the old
DDR3 training implementation to fix those issues by setting the EEPROM
field "Use old DDR training":
eeprom update "Use old DDR training" 1
Signed-off-by: Marek Behún <kabel@kernel.org>
Some Turris Omnia boards experience memory issues, and by
experimentation we found that some of these issues can be solved by
slowing DDR speed.
Add a new field in the extended EEPROM information structure, ddr_speed.
Support several values in this field (for now 1066F, 1333H, and the
default, 1600K) and use it to overwrite the DDR topology parameters
used by the DDR training algorithm.
Signed-off-by: Marek Behún <kabel@kernel.org>
Implement Turris Omnia EEPROM layout for the 'eeprom' command.
When the 'eeprom' command (with layout support) is enabled, we can now
use the 'eeprom print' and 'eeprom update' commands, for example:
=> eeprom print
Magic constant 34a04103
RAM size in GB 2
Wi-Fi Region
CRC32 checksum cecbc2a1
Signed-off-by: Marek Behún <kabel@kernel.org>
