Open Firmware

Open Firmware Svn Source Tree

Root/dev/hdaudio

File Age Rev Message Size
  ..
tree build 8 years 1 month 1221 wmb: Added HDAudio driver from Luke Gorrie.
blob audio.fth 8 years 1 month 1221 wmb: Added HDAudio driver from Luke Gorrie. 304 bytes
blob conexant.fth 6 years 1 month 2303 wmb: OLPC - more tweaking of audio analysis parameter passing, hopefully making both XO-1.5 and XO-1.75 builds work. 6.55 kB
blob config.fth 7 years 29 days 1844 wmb: HDaudio driver - completed the list of HDaudio configuration default field values and changed some names for clarity. 4.14 kB
blob core.fth 6 years 1 month 2298 wmb: OLPC - fixed XO-1.5 build problem introduced by XO-1.75 audio test. 19.14 kB
blob cx2058x-nodes.fth 7 years 1 month 1841 wmb: OLPC XO-1.5 - tweaks to ACPI DSDT and HDAudio configuration reporting to make Windows happy. Thanks to Luna. 2.19 kB
blob extra.fth 8 years 1 month 1221 wmb: Added HDAudio driver from Luke Gorrie. 5.57 kB
blob hdaudio.bth 6 years 8 months 2019 wmb: OLPC XO-1.75 - Rudimentary sound, rtc, accelerometer, compass drivers. More compact sdhci driver. EC reflash support. 434 bytes
blob noiseburst.fth 4 years 4 months 3623 wmb: OLPC XO-4 - improved the reliability of the audio test: a) Instead of the real random number generator, use a LFSR-based PRNG, with a polynomial that happens to give a good spectrum for acoustic testing with OLPC speakers. In addition to working around a unit- dependent problem with the MMP3's hardware RNG, this also speeds up the test because the LFSR is faster than the hardware RNG. b) Store 16-bit "random" values in the audio buffer instead of using 32-bit random numbers and hoping that the top and bottom halves are uncorrelated. This seems to give better decorrelation of left and right signals. c) Hard-reset the audio subsystem by powering off/on the audio island between the acoustic and loopback tests, thus making the loopback test more repeatable. 20.27 kB
blob olpc-ports.fth 6 years 1 month 2298 wmb: OLPC - fixed XO-1.5 build problem introduced by XO-1.75 audio test. 3.07 kB
blob start-cx2058x.fth 6 years 10 months 1958 wmb: OLPC trac 10371 - Added commentary describing the meaning of some changes in the Conexant HDAudio CODEC vendor node setup values. 10.29 kB
blob test.fth 4 years 4 months 3623 wmb: OLPC XO-4 - improved the reliability of the audio test: a) Instead of the real random number generator, use a LFSR-based PRNG, with a polynomial that happens to give a good spectrum for acoustic testing with OLPC speakers. In addition to working around a unit- dependent problem with the MMP3's hardware RNG, this also speeds up the test because the LFSR is faster than the hardware RNG. b) Store 16-bit "random" values in the audio buffer instead of using 32-bit random numbers and hoping that the top and bottom halves are uncorrelated. This seems to give better decorrelation of left and right signals. c) Hard-reset the audio subsystem by powering off/on the audio island between the acoustic and loopback tests, thus making the loopback test more repeatable. 8.55 kB

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