Hi,
after getting dcache support for Raspberry Pi 1 (see other thread) to work: I wanted to do that for rpi2 too. But even without dcaches rpi2 is slower than rpi1 for both MMC and USB ethernet. I have no idea why, but trying the new dhry command from current origin/master confirms my suspicion.
bcm2835 (w/o dcache): U-Boot> dhry 1000000 iterations in 10948 ms: 91340/s, 51 DMIPS
bcm2835 (w/ dcache): U-Boot> dhry 1000000 iterations in 1656 ms: 603864/s, 343 DMIPS
bcm2836 (w/o dcache): U-Boot> dhry 1000000 iterations in 43247 ms: 23122/s, 13 DMIPS
Independent from the dcache difference it seems totally wrong to me that the bcm2836 is about 4 times slower than the bcm2835. I have this in my config.txt of bcm2835:
kernel=u-boot.bin
#force rpi to assume there is always a HDMI link hdmi_force_hotplug=1 #force normal HDMI (incl. sound) hdmi_drive=2
gpu_mem=16
arm_freq=800 core_freq=300 sdram_freq=400 over_voltage=0
While having only this line at bcm2836:
kernel=u-boot.bin
Does someone experience the same? What might be wrong here? Do I need some config.txt settings to get bcm2836 running as fast as it should.
Best regards, Alexander