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| /freebsd-11-stable/sys/arm/broadcom/bcm2835/ | ||
| H A D | bcm2835_sdhci.c | diff 246888 Sat Feb 16 22:38:31 MST 2013 gonzo - Add hw.bcm2835.sdhci.hs tunable to enable/disable highspeed mode in SDHCI driver Suggested by: Daisuke Aoyama - Set initilization sequence frequency to 8MHz. It should fix Data CRC errors. Standard requires initialization sequence to be executed at 400KHz but on this hardware low frequncies seems to cause Data CRC errors. Value was derived from analyzing hardware signals after Raspberry Pi is powered up. Before any data is read though DATA line adapter's clock frequency is changed to 8MHz. Modern cards should function fine at 8MHz but for older MMC cards it can be overriden by setting hw.bcm2835.sdhci.min_freq tunable. |
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