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From: Alistair Francis <alistair.francis@wdc.com>
To: peter.maydell@linaro.org
Subject: [PULL 13/16] hw/block: m25p80: Support fast read for SST flashes
Date: Mon, 22 Mar 2021 21:57:53 -0400
Message-Id: <20210323015756.3168650-14-alistair.francis@wdc.com>
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Cc: alistair23@gmail.com, Bin Meng <bin.meng@windriver.com>,
Alistair Francis <alistair.francis@wdc.com>, qemu-devel@nongnu.org
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From: Bin Meng <bin.meng@windriver.com>
Per SST25VF016B datasheet [1], SST flash requires a dummy byte after
the address bytes. Note only SPI mode is supported by SST flashes.
[1] http://ww1.microchip.com/downloads/en/devicedoc/s71271_04.pdf
Signed-off-by: Bin Meng <bin.meng@windriver.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210306060152.7250-1-bmeng.cn@gmail.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
hw/block/m25p80.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index 5f9471d83c..183d3f44c2 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -895,6 +895,9 @@ static void decode_fast_read_cmd(Flash *s)
s->needed_bytes =3D get_addr_length(s);
switch (get_man(s)) {
/* Dummy cycles - modeled with bytes writes instead of bits */
+ case MAN_SST:
+ s->needed_bytes +=3D 1;
+ break;
case MAN_WINBOND:
s->needed_bytes +=3D 8;
break;
--=20
2.30.1