Add 1-bit SDIO with the minimum pins required for that mode: GPIOs 22… #1301
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Can you explain why this requires 4 pins and not the expected 3 (CLK, CMD + DAT0)? |
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I believe DAT1 pin is specified/used as INT in one bit mode. Whether that is used in practice on the Pi's mmc peripheral when in one bit mode I have not checked. All the better if we can spare another pin - I'll take a look. |
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Attempting to run 1-bit mode with just three wires caused lock-ups. It seems the fourth D1/INT is essential. |
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Add 1-bit SDIO with the minimum pins required for that mode: GPIOs 22…
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Thanks for the clarification. |
popcornmix
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See: raspberrypi/linux#1294 kernel: config: Enable HCI over UARTs kernel: Add 1-bit SDIO with the minimum pins required for that mode: GPIOs 22-25 See: raspberrypi/linux#1301 kernel: ASoC: bcm: add missing .owner fields in sound card drivers See: raspberrypi/linux#1300 kernel: Add overlay and enable support for QCA7000 board See: raspberrypi/linux#1308 kernel: bcm2835-virtgpio: Virtual GPIO driver kernel: BCM270X_DT: Add Pi3 support firmware: arm_ldconfig: Use arm_loader API for determining clock frequencies
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See: raspberrypi/linux#1294 kernel: config: Enable HCI over UARTs kernel: Add 1-bit SDIO with the minimum pins required for that mode: GPIOs 22-25 See: raspberrypi/linux#1301 kernel: ASoC: bcm: add missing .owner fields in sound card drivers See: raspberrypi/linux#1300 kernel: Add overlay and enable support for QCA7000 board See: raspberrypi/linux#1308 kernel: bcm2835-virtgpio: Virtual GPIO driver kernel: BCM270X_DT: Add Pi3 support firmware: arm_ldconfig: Use arm_loader API for determining clock frequencies
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@pelwell looks like I forgot to add the overlay to the Makefile in the PR, so the .dtbo is not being compiled. |
pelwell
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See: #1301 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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Fixed in 4.4. 4.1 is closed now. |
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See: #1301 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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See: #1301 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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See: #1301 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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See: raspberrypi/linux#1301 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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See: raspberrypi/linux#1294 kernel: config: Enable HCI over UARTs kernel: Add 1-bit SDIO with the minimum pins required for that mode: GPIOs 22-25 See: raspberrypi/linux#1301 kernel: ASoC: bcm: add missing .owner fields in sound card drivers See: raspberrypi/linux#1300 kernel: Add overlay and enable support for QCA7000 board See: raspberrypi/linux#1308 kernel: bcm2835-virtgpio: Virtual GPIO driver kernel: BCM270X_DT: Add Pi3 support firmware: arm_ldconfig: Use arm_loader API for determining clock frequencies
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…-25.
For increased compatibility with other hardware, it's useful to force SDIO into 1 bit mode & free up GPIOs 26, 27 (SD_D2, SD_D3). Variable pin numbers isn't possible, so an overlay separate from the existing 4-bit/1-bit dual mode overlay is proposed.