Re: [Qemu-devel] [PATCH v5 02/13] m25p80: Add support for SST READ ID 0x90/0xAB commands

["mar.krzeminski" <mar.krzeminski@gmail.com>]

W dniu 29.10.2017 o 11:13, Francisco Iglesias pisze:
> Add support for SST READ ID 0x90/0xAB commands for reading out the flash
> manufacuter ID and device ID.
>
> Signed-off-by: Francisco Iglesias <frasse.iglesias@gmail.com>
> Acked-by: Alistair Francis <alistair.francis@xilinx.com>
> ---
>   hw/block/m25p80.c | 23 +++++++++++++++++++++++
>   1 file changed, 23 insertions(+)
>
> diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
> index 2971519..7a5c137 100644
> --- a/hw/block/m25p80.c
> +++ b/hw/block/m25p80.c
> @@ -355,6 +355,8 @@ typedef enum {
>       DPP = 0xa2,
>       QPP = 0x32,
>       QPP_4 = 0x34,
> +    RDID_90 = 0x90,
> +    RDID_AB = 0xab,
>   
>       ERASE_4K = 0x20,
>       ERASE4_4K = 0x21,
> @@ -405,6 +407,7 @@ typedef enum {
>       MAN_MACRONIX,
>       MAN_NUMONYX,
>       MAN_WINBOND,
> +    MAN_SST,
>       MAN_GENERIC,
>   } Manufacturer;
>   
> @@ -476,6 +479,8 @@ static inline Manufacturer get_man(Flash *s)
>           return MAN_SPANSION;
>       case 0xC2:
>           return MAN_MACRONIX;
> +    case 0xBF:
> +        return MAN_SST;
>       default:
>           return MAN_GENERIC;
>       }
> @@ -711,6 +716,22 @@ static void complete_collecting_data(Flash *s)
>       case WEVCR:
>           s->enh_volatile_cfg = s->data[0];
>           break;
> +    case RDID_90:
> +    case RDID_AB:
> +        if (get_man(s) == MAN_SST && s->cur_addr <= 1) {
> +            if (s->cur_addr) {
> +                s->data[0] = s->pi->id[2];
> +                s->data[1] = s->pi->id[0];
> +            } else {
> +                s->data[0] = s->pi->id[0];
> +                s->data[1] = s->pi->id[2];
> +            }
> +            s->pos = 0;
> +            s->len = 2;
> +            s->data_read_loop = true;
> +            s->state = STATE_READING_DATA;
Do you know how the real HW will behave?
When you get two bytes, it will send them once again or will wait for 
address?
> +        }
> +        break;
>       default:
>           break;
>       }
> @@ -926,6 +947,8 @@ static void decode_new_cmd(Flash *s, uint32_t value)
>       case PP4:
>       case PP4_4:
>       case DIE_ERASE:
> +    case RDID_90:
> +    case RDID_AB:
>           s->needed_bytes = get_addr_length(s);
If I understand correctly, for above commands allowed address length is 
3 bytes,
but get_add_length can return 4. To avoid strange error I suggest to add 
case entry for them
in get_addr_length.

>           s->pos = 0;
>           s->len = 0;
Regards,
Marcin