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diff --git a/shakti/m_class/sdmmc.mdwn b/shakti/m_class/sdmmc.mdwn
index 0dc3ff5bc5a8437b4ab2ef649701832bd85d90b3..14569caa5b5caed178c94865753e218541abcbac 100644 (file)
--- a/shakti/m_class/sdmmc.mdwn
+++ b/shakti/m_class/sdmmc.mdwn
@@ -5,3 +5,10 @@
 * (needs work) <https://opencores.org/project,sdcard_mass_storage_controller>
 * <https://github.com/enjoy-digital/litesdcard> - needs investigation
 * <https://github.com/lowRISC/lowrisc-chip/tree/ethernet-v0.5/src/main/verilog> - looks good.
+
+# Requirements
+
+* eMMC 8-bit mode
+* SD/MMC 1, 2 and 4-bit mode
+* SPI compatible
+* Must be libre BSD or MIT Licensed (no restrictions, no non-free "non-commercial" clauses).