Re: [Qemu-devel] [PATCH v3 03/18] sdcard: fix the 'maximum data transfer rate' to 25MHz

[Alistair Francis]

On Mon, Jan 22, 2018 at 7:30 PM, Philippe Mathieu-Daudé <address@hidden> wrote:
> To comply with Spec v1.10 (and 2.00, 3.01):
>
> . TRAN_SPEED
>
> for current SD Memory Cards that field must be always 0_0110_010b (032h) 
> which is
> equal to 25MHz - the mandatory maximum operating frequency of SD Memory Card.
>
> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>

Reviewed-by: Alistair Francis <address@hidden>

Alistair

> ---
>  hw/sd/sd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/sd/sd.c b/hw/sd/sd.c
> index f6318c6fdb..56df5b660a 100644
> --- a/hw/sd/sd.c
> +++ b/hw/sd/sd.c
> @@ -356,7 +356,7 @@ static void sd_reset_csd(SDState *sd, uint64_t size)
>          sd->csd[0] = 0x00;     /* CSD structure */
>          sd->csd[1] = 0x26;     /* Data read access-time-1 */
>          sd->csd[2] = 0x00;     /* Data read access-time-2 */
> -        sd->csd[3] = 0x5a;     /* Max. data transfer rate */
> +        sd->csd[3] = 0x32;  /* Max. data transfer rate: 25 MHz */
>          sd->csd[4] = 0x5f;     /* Card Command Classes */
>          sd->csd[5] = 0x50 |    /* Max. read data block length */
>              HWBLOCK_SHIFT;
> --
> 2.15.1
>
>