SD/MMC (including eMMC)

• http://bugs.libre-riscv.org/show_bug.cgi?id=7
• https://opencores.org/project,sd_mmc_emulator
• (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.
• https://github.com/mczerski/SD-card-controller

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).
• AXI interface preferred, Wishbone acceptable (bridge will be used).
• Linux kernel driver needed (preferred).