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| author | gonzo <gonzo@FreeBSD.org> | 2013-02-17 00:23:42 +0000 |
|---|---|---|
| committer | gonzo <gonzo@FreeBSD.org> | 2013-02-17 00:23:42 +0000 |
| commit | 49100b4dc28e35ff854e4ad41151175587323b1f (patch) | |
| tree | 3c195b128c49f153627090d146a6f89f41f2b7a0 /lib/libc | |
| parent | baf1079adc1673d7cdbb130249a0af6b71b8a5eb (diff) | |
| download | FreeBSD-src-49100b4dc28e35ff854e4ad41151175587323b1f.zip FreeBSD-src-49100b4dc28e35ff854e4ad41151175587323b1f.tar.gz | |
- 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.
Diffstat (limited to 'lib/libc')
0 files changed, 0 insertions, 0 deletions
