Linux/AM5749: How to change RAM size

Hi Oleg,

You can open a new e2e question when you are ready.

Regards,
Vishal

Hi Oleg,

Thanks for the feedback. Yes, unfortunately the conversion from XLS to u-boot was not very streamlined for this SOC. The tool does output the same type of structures, but it is not a simple copy and paste. We have made improvements to this process on future SOCs.

Regarding your questions related to why the AM574x development kit has 5 memories, there are two 16-bit memories (4Gb) for each EMIF data bus, plus one memory for ECC on EMIF1. ECC does not contribute to the total available memory size, thus the development kit has 2GB total memory across the two EMIF controllers. This is also documented in the AM574x development kit user guide, as shown below. 

5.1 DDR3L SDRAM The AM574x IDK EVM design supports two banks of DDR3L SDRAM where each is attached to a separate EMIF on the AM5748 processor. Each EMIF can support up to 2GB at speeds up to 1066MT/s. Each EMIF on the IDK EVM contains two 4Gbit (256M × 16) SDRAMs for a total of 1GB of DDR3L SDRAM memory on each EMIF. The part number for the DDR3L SDRAM memory used is MT41K256M16HA-125 that contains timing for 1600MT/s operation. The package used is the 96-ball TFBGA package. See the AM574x Technical Reference Manual (SPRUIH8) for memory locations for this memory. The first EMIF also contains an SDRAM attached to the ECC byte lane 

The memories you are using appear to be very similar to what is populated on the development kit. Although the development kit has an SDRAM populated on the ECC bus, my understanding is that the SDK default configuration should not enable ECC; thus, the default settings should work as-is on your custom board under nominal conditions. 

Regarding your other E2E posts, I do not understand why you mention you only have 1.5 GB of memory, where in this thread the configuration you have provided would total 2GB.