Latest firmware forces sdram_freq to always be 400mhz #172
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Yes, it's a side effect of the improved analogue audio that we haven't resolved yet. (changing sdram frequency dynamically can cause an audio interruption) For now, add |
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firmware: Clamp SDRAM frequencies only when sdm audio is active See: Hexxeh/rpi-firmware#172 firmware: arm_dt: Improve DTB location, upstream kernel support See: #943
popcornmix
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firmware: Clamp SDRAM frequencies only when sdm audio is active See: #172 firmware: arm_dt: Improve DTB location, upstream kernel support See: raspberrypi/firmware#943
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This issue should be resolved with latest rpi-update firmware. |
mkreisl
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Hello,
I've been trying to overclock a Pi 3, and, to my surprise, vcgencmd always reports sdram_freq as 400. This was very intriguing since the default is supposed to be 450. (I was shooting for 600 with the help of overvoltage and schmoo parameters, and those were indeed taken into account).
I downgraded to the "default" kernel version with the help of this command I found in a closed issue:
sudo apt-get install --reinstall raspberrypi-bootloader raspberrypi-kernelAnd this solved the issue. sdram_freq was reported by vcgencmd to be 450 by default, and whatever number I set it to in /boot/config.txt if present.
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