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sdcard: clean the SCR register and add few comments

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Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Message-id: 20180215221325.7611-5-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2018-02-22 15:12:53 +00:00 committed by Peter Maydell
parent d7ecb86752
commit 9b7ec55c5c
1 changed files with 6 additions and 3 deletions
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9
hw/sd/sd.c
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@ -298,10 +298,13 @@ static void sd_ocr_powerup(void *opaque)
static void sd_set_scr(SDState *sd)
{
sd->scr[0] = 0x00; /* SCR Structure */
sd->scr[1] = 0x2f; /* SD Security Support */
sd->scr[2] = 0x00;
sd->scr[0] = (0 << 4) /* SCR version 1.0 */
| 0; /* Spec Versions 1.0 and 1.01 */
sd->scr[1] = (2 << 4) /* SDSC Card (Security Version 1.01) */
| 0b0101; /* 1-bit or 4-bit width bus modes */
sd->scr[2] = 0x00; /* Extended Security is not supported. */
sd->scr[3] = 0x00;
/* reserved for manufacturer usage */
sd->scr[4] = 0x00;
sd->scr[5] = 0x00;
sd->scr[6] = 0x00;