Hi
I recently attempted to upgrade my Raspberry Pi 5 by replacing its original RAM chip with a 16GB SDRAM module. However, the device fails to boot and returns a "SDRAM mismatch" error via the serial console. Below are the critical logs from the boot process:Observations:
The bootloader detects the new RAM as "128 Gbit" (likely 16GB), but reports "Unsupported memory size".
Error code 9 explicitly states an SDRAM compatibility issue.
According to the official documentation, the D0-stepping SoC should support 16GB RAM. My upgraded Pi 5 uses the same BCM2712 D0-stepping SoC as confirmed by the chip marking.
Questions:
Is the Raspberry Pi 5's firmware/SoC fundamentally limited to supporting up to 8GB RAM, or could this be a configuration issue?
If hardware modifications are required beyond replacing the RAM chip (e.g., resistor reconfiguration, voltage adjustments), are there documented guidelines?
Would updating the bootloader or EEPROM potentially resolve this compatibility error?
Any insights into troubleshooting steps or hardware limitations would be greatly appreciated.
I recently attempted to upgrade my Raspberry Pi 5 by replacing its original RAM chip with a 16GB SDRAM module. However, the device fails to boot and returns a "SDRAM mismatch" error via the serial console. Below are the critical logs from the boot process:
Code:
1.95 uSD voltage 3.3V 1.14 Initialising SDRAM rank 2 total-size: 128 Gbit 4267 1.18 Unsupported memory size: 128 1.21 USB-OTG disconnect 1.23 BOOT ERROR: code 9 - 'SDRAM mismatch' The bootloader detects the new RAM as "128 Gbit" (likely 16GB), but reports "Unsupported memory size".
Error code 9 explicitly states an SDRAM compatibility issue.
According to the official documentation, the D0-stepping SoC should support 16GB RAM. My upgraded Pi 5 uses the same BCM2712 D0-stepping SoC as confirmed by the chip marking.
Questions:
Is the Raspberry Pi 5's firmware/SoC fundamentally limited to supporting up to 8GB RAM, or could this be a configuration issue?
If hardware modifications are required beyond replacing the RAM chip (e.g., resistor reconfiguration, voltage adjustments), are there documented guidelines?
Would updating the bootloader or EEPROM potentially resolve this compatibility error?
Any insights into troubleshooting steps or hardware limitations would be greatly appreciated.
Statistics: Posted by Kyrin — Wed Mar 12, 2025 10:13 am