path: root/drivers/fpga
diff options
authorJason Gunthorpe <jgunthorpe@obsidianresearch.com>2017-02-01 12:48:43 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-10 15:20:44 +0100
commitb496df86ac1bbe393a55ddbfed35d46e74ef9767 (patch)
tree0f87f727e68acab692280c556f6376237a68c64a /drivers/fpga
parent6b45e0f24c7b5316dea7ed5995e1b809a3266b43 (diff)
fpga zynq: Check the bitstream for validity
There is no sense in sending a bitstream we know will not work, and with the variety of options for bitstream generation in Xilinx tools it is not terribly clear what the correct input should be. This is particularly important for Zynq since auto-correction was removed from the driver and the Zynq hardware only accepts a bitstream format that is different from what the Xilinx tools typically produce. Worse, the hardware provides no indication why the bitstream fails, it simply times out if the input is wrong. The best option here is to have the kernel print a message informing the user they are using a malformed bistream and programming failure isn't for any of the myriad of other reasons. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Acked-by: Moritz Fischer <moritz.fischer@ettus.com> Acked-by: Alan Tull <atull@opensource.altera.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga')
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c
index f674e32832ec..c3fc2a231e28 100644
--- a/drivers/fpga/zynq-fpga.c
+++ b/drivers/fpga/zynq-fpga.c
@@ -161,6 +161,19 @@ static irqreturn_t zynq_fpga_isr(int irq, void *data)
+/* Sanity check the proposed bitstream. It must start with the sync word in
+ * the correct byte order, and be dword aligned. The input is a Xilinx .bin
+ * file with every 32 bit quantity swapped.
+ */
+static bool zynq_fpga_has_sync(const u8 *buf, size_t count)
+ for (; count >= 4; buf += 4, count -= 4)
+ if (buf[0] == 0x66 && buf[1] == 0x55 && buf[2] == 0x99 &&
+ buf[3] == 0xaa)
+ return true;
+ return false;
static int zynq_fpga_ops_write_init(struct fpga_manager *mgr,
struct fpga_image_info *info,
const char *buf, size_t count)
@@ -177,6 +190,13 @@ static int zynq_fpga_ops_write_init(struct fpga_manager *mgr,
/* don't globally reset PL if we're doing partial reconfig */
if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
+ if (!zynq_fpga_has_sync(buf, count)) {
+ dev_err(&mgr->dev,
+ "Invalid bitstream, could not find a sync word. Bitstream must be a byte swapped .bin file\n");
+ err = -EINVAL;
+ goto out_err;
+ }
/* assert AXI interface resets */
regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET,
@@ -410,6 +430,7 @@ static enum fpga_mgr_states zynq_fpga_ops_state(struct fpga_manager *mgr)
static const struct fpga_manager_ops zynq_fpga_ops = {
+ .initial_header_size = 128,
.state = zynq_fpga_ops_state,
.write_init = zynq_fpga_ops_write_init,
.write = zynq_fpga_ops_write,

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