From: Kane-Chen-AS <kane_c...@aspeedtech.com>
This patch introduces a 'drive' property to the Aspeed OTP device,
allowing it to be backed by a block device. Users can now preload
OTP data via QEMU CLI using a block backend.
Example usage:
./qemu-system-arm \
-blockdev driver=file,filename=otpmem.img,node-name=otp \
-global aspeed-otp.drive=otp \
...
If the drive is provided, its content will be loaded as the initial OTP
state. Otherwise, an internal memory buffer will be used.
Signed-off-by: Kane-Chen-AS <kane_c...@aspeedtech.com>
Reviewed-by: Cédric Le Goater <c...@redhat.com>
---
hw/nvram/aspeed_otp.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/hw/nvram/aspeed_otp.c b/hw/nvram/aspeed_otp.c
index e5b7ca9676..abb3731823 100644
--- a/hw/nvram/aspeed_otp.c
+++ b/hw/nvram/aspeed_otp.c
@@ -35,13 +35,25 @@ static bool aspeed_otp_init_storage(AspeedOTPState *s,
Error **errp)
{
uint32_t *p;
int i, num;
+ uint64_t perm;
+ if (s->blk) {
+ perm = BLK_PERM_CONSISTENT_READ |
+ (blk_supports_write_perm(s->blk) ? BLK_PERM_WRITE : 0);
+ if (blk_set_perm(s->blk, perm, BLK_PERM_ALL, errp) < 0) {
+ return false;
+ }
+ if (blk_pread(s->blk, 0, s->size, s->storage, 0) < 0) {
+ error_setg(errp, "Failed to read the initial flash content");
+ return false;
+ }
+ } else {
num = s->size / sizeof(uint32_t);
p = (uint32_t *)s->storage;
for (i = 0; i < num; i++) {
p[i] = (i % 2 == 0) ? 0x00000000 : 0xFFFFFFFF;
}
-
+ }
return true;
}
@@ -75,6 +87,7 @@ static void aspeed_otp_realize(DeviceState *dev, Error **errp)
static const Property aspeed_otp_properties[] = {
DEFINE_PROP_UINT64("size", AspeedOTPState, size, 0),
+ DEFINE_PROP_DRIVE("drive", AspeedOTPState, blk),
};
static void aspeed_otp_class_init(ObjectClass *klass, const void *data)
--
2.43.0
