[PATCH 1/4] mmc: sandbox: Initialize the status register

From: Sean Anderson <seanga2@gmail.com>
To: u-boot@lists.denx.de
Cc: Peng Fan <peng.fan@nxp.com>, Simon Glass <sjg@chromium.org>,
	Jaehoon Chung <jh80.chung@samsung.com>,
	Sean Anderson <seanga2@gmail.com>
Subject: [PATCH 1/4] mmc: sandbox: Initialize the status register
Date: Wed, 30 Mar 2022 12:54:43 -0400	[thread overview]
Message-ID: <20220330165446.438925-2-seanga2@gmail.com> (raw)
In-Reply-To: <20220330165446.438925-1-seanga2@gmail.com>

The send status command expects the status register to be returned as a
response. Without writing data back, whatever is on the stack will be
interpreted as the status register. There are a lot of fields in this
register, but fortunately all zeros is interpreted as "we don't support
anything."

Signed-off-by: Sean Anderson <seanga2@gmail.com>
---

 drivers/mmc/sandbox_mmc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/sandbox_mmc.c b/drivers/mmc/sandbox_mmc.c
index 451fe4a4e5..35159451e1 100644
--- a/drivers/mmc/sandbox_mmc.c
+++ b/drivers/mmc/sandbox_mmc.c
@@ -57,6 +57,7 @@ static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 		break;
 	case MMC_CMD_SEND_STATUS:
 		cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
+		memset(data->dest, '\0', data->blocks * data->blocksize);
 		break;
 	case MMC_CMD_SELECT_CARD:
 		break;
-- 
2.35.1

