AndrewD commented on a change in pull request #5835:
URL: https://github.com/apache/incubator-nuttx/pull/5835#discussion_r834056629
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File path: include/nuttx/sdio.h
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@@ -477,6 +477,7 @@
#define SDIO_CAPS_DMABEFOREWRITE 0x04 /* Bit 2=1: Executes DMA before write
command */
#define SDIO_CAPS_4BIT 0x08 /* Bit 3=1: Supports 4 bit operation */
#define SDIO_CAPS_8BIT 0x10 /* Bit 4=1: Supports 8 bit operation */
+#define SDIO_CAPS_4BIT_ONLY 0x20 /* Bit 5=1: Supports 4-bit only
operation */
Review comment:
The issue is that the peripheral does not support 1bit mode, so 4 bit
mode must be selected _before_ checking the SCR register.
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