Re: [PATCH v2 3/4] ddr: imx: Allow to call ddr init without logging failure
Marek Vasut <[email protected]>
| Newsgroups | org.u-boot-project.lists.u-boot |
|---|---|
| Message-ID | <[email protected]> |
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.