From: Aswin Murugan <aswin.murugan@oss.qualcomm.com>
Date: Thu, 16 Apr 2026 09:10:47 +0000 (+0530)
Subject: scsi: Enable FUA bit in WRITE10 commands
X-Git-Tag: v2026.07-rc1~1^2
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=4b42c59a34bb9364bd2228fd2fead0c5750e7abf;p=thirdparty%2Fu-boot.git

scsi: Enable FUA bit in WRITE10 commands

Enable the Force Unit Access (FUA) bit in SCSI WRITE10 commands to
ensure writes bypass the device's volatile cache and go directly to
non-volatile storage. This provides write-through behavior that prevents
data loss during board resets.

Reviewed-by: Varadarajan Narayanan <varadarajan.narayanan@oss.qualcomm.com>
Signed-off-by: Aswin Murugan <aswin.murugan@oss.qualcomm.com>
Signed-off-by: Balaji Selvanathan <balaji.selvanathan@oss.qualcomm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 9a417795851..50e7d749921 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -107,7 +107,7 @@ static void scsi_setup_write_ext(struct scsi_cmd *pccb, lbaint_t start,
 				 lbaint_t blocks)
 {
 	pccb->cmd[0] = SCSI_WRITE10;
-	pccb->cmd[1] = 0;
+	pccb->cmd[1] = 0x08; /* Set FUA bit to bypass write cache */
 	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
 	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
 	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;