On 8/19/26 12:10 PM, Frieder Schrempf wrote:
On 19.08.26 12:04, Marek Vasut wrote:
On 8/19/26 9:07 AM, Frieder Schrempf wrote:
From: Frieder Schrempf <[email protected]>
In some cases we need to call ddr_init() multiple times to try
different configurations.
What different configurations ? Details please ?
The detection of different DDR types/sizes on our SoMs has always been
based on trying the init and seeing if it succeeds, falling back to the
smaller sizes on failure. See here [1].
Could you maybe bring the interface up in some minimal 400 MTps or 100
MTps configuration and then read out the MR ID registers from the DRAM
to discern which DRAM configuration is present on your SoM? This would
be the ideal generic way of doing this, and it would be reliable since
the IDs are stable and surely indicate which DRAM chip and how big it is.
