Commit 9157dd59 authored by Philippe Mathieu-Daudé's avatar Philippe Mathieu-Daudé
Browse files

hw/sd/sdcard: Restrict Class 6 commands to SCSD cards 



Only SCSD cards support Class 6 (Block Oriented Write Protection)
commands.

  "SD Specifications Part 1 Physical Layer Simplified Spec. v3.01"

  4.3.14 Command Functional Difference in Card Capacity Types

  * Write Protected Group

  SDHC and SDXC do not support write-protected groups. Issuing
  CMD28, CMD29 and CMD30 generates the ILLEGAL_COMMAND error.

Cc: qemu-stable@nongnu.org
Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: default avatarAlistair Francis <alistair.francis@wdc.com>
Message-Id: <20200630133912.9428-7-f4bug@amsat.org>
parent 6a289a5b

hw/sd/sd.c

+5 −0
Original line number Diff line number Diff line
@@ -920,6 +920,11 @@ static sd_rsp_type_t sd_normal_command(SDState *sd, SDRequest req) 
        sd->multi_blk_cnt = 0;

    }



    if (sd_cmd_class[req.cmd] == 6 && FIELD_EX32(sd->ocr, OCR, CARD_CAPACITY)) {

        /* Only Standard Capacity cards support class 6 commands */

        return sd_illegal;

    }



    switch (req.cmd) {

    /* Basic commands (Class 0 and Class 1) */

    case 0:	/* CMD0:   GO_IDLE_STATE */