reverend_t Posted July 5, 2018 Share Posted July 5, 2018 Hi all Given that the node that H3 consumption uses to change DRAM frequency no longer exists on H5 on the mainline kernel, how would one go about altering this? Link to comment Share on other sites More sharing options...
jernej Posted July 5, 2018 Share Posted July 5, 2018 1 hour ago, reverend_t said: how would one go about altering this? If you are ok with fixed lower frequency, you can rebuild U-Boot, or more specifically, SPL with wanted frequency and use that one instead. Link to comment Share on other sites More sharing options...
reverend_t Posted July 5, 2018 Author Share Posted July 5, 2018 Ah OK, so there are no userspace hooks for this? Would it involve editing the following file https://github.com/armbian/build/blob/master/patch/u-boot/u-boot-sunxi-dev/add-orangepi-zeroplus.patch for the OPi0+ and changing the DRAM lines: @ -0,0 +1,22 @@ +CONFIG_ARM=y +CONFIG_ARCH_SUNXI=y +CONFIG_SYS_TEXT_BASE=0x4a000000 +CONFIG_SPL_SPI_FLASH_SUPPORT=y +CONFIG_MACH_SUN50I_H5=y +CONFIG_DRAM_CLK=624 +CONFIG_DRAM_ZQ=3881977 Link to comment Share on other sites More sharing options...
jernej Posted July 5, 2018 Share Posted July 5, 2018 1 hour ago, reverend_t said: Ah OK, so there are no userspace hooks for this? No, unless you want to write a driver for completely undocumented controller with no or very little source code (reverse engineering ftw). It seems that something can be concluded from sunxi-dramfreq.c, which can be found in BSP kernel source, but AFAIK, no one works on that. Yes, you have to change CONFIG_DRAM_CLK. But be very careful what you set here. Going up is completely discouraged. Link to comment Share on other sites More sharing options...
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