From d9e07385daa59f945016850f075ef55d1784799f Mon Sep 17 00:00:00 2001
From: ckolivas <kernel@kolivas.org>
Date: Fri, 10 Feb 2012 15:19:45 +1100
Subject: [PATCH] Search for nonce if it is not found to be correct as a
 debugging check.

---
 findnonce.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/findnonce.c b/findnonce.c
index 7d12be73..8fefb5c8 100644
--- a/findnonce.c
+++ b/findnonce.c
@@ -167,6 +167,53 @@ struct pc_data {
 	pthread_t pth;
 };
 
+static void find_nonce(struct pc_data *pcd)
+{
+	dev_blk_ctx *blk = &pcd->work->blk;
+	struct thr_info *thr = pcd->thr;
+	cl_uint A, B, C, D, E, F, G, H;
+	struct work *work = pcd->work;
+	cl_uint W[16], nonce;
+
+	for (nonce = 0; nonce < 0xFFFFFFFF; nonce++) {
+		A = blk->cty_a; B = blk->cty_b;
+		C = blk->cty_c; D = blk->cty_d;
+		E = blk->cty_e; F = blk->cty_f;
+		G = blk->cty_g; H = blk->cty_h;
+		W[0] = blk->merkle; W[1] = blk->ntime;
+		W[2] = blk->nbits; W[3] = nonce;;
+		W[4] = 0x80000000; W[5] = 0x00000000; W[6] = 0x00000000; W[7] = 0x00000000;
+		W[8] = 0x00000000; W[9] = 0x00000000; W[10] = 0x00000000; W[11] = 0x00000000;
+		W[12] = 0x00000000; W[13] = 0x00000000; W[14] = 0x00000000; W[15] = 0x00000280;
+		PIR(0); IR(8);
+		FR(16); FR(24);
+		FR(32); FR(40);
+		FR(48); FR(56);
+
+		W[0] = A + blk->ctx_a; W[1] = B + blk->ctx_b;
+		W[2] = C + blk->ctx_c; W[3] = D + blk->ctx_d;
+		W[4] = E + blk->ctx_e; W[5] = F + blk->ctx_f;
+		W[6] = G + blk->ctx_g; W[7] = H + blk->ctx_h;
+		W[8] = 0x80000000; W[9] = 0x00000000; W[10] = 0x00000000; W[11] = 0x00000000;
+		W[12] = 0x00000000; W[13] = 0x00000000; W[14] = 0x00000000; W[15] = 0x00000100;
+		A = 0x6a09e667; B = 0xbb67ae85;
+		C = 0x3c6ef372; D = 0xa54ff53a;
+		E = 0x510e527f; F = 0x9b05688c;
+		G = 0x1f83d9ab; H = 0x5be0cd19;
+		IR(0); IR(8);
+		FR(16); FR(24);
+		FR(32); FR(40);
+		FR(48); PFR(56);
+	}
+
+	if (unlikely(H == 0xA41F32E7)) {
+		applog(LOG_WARNING, "Nonce found at %d", nonce);
+		if (unlikely(submit_nonce(thr, work, nonce) == false))
+			applog(LOG_ERR, "Failed to submit work, exiting");
+		return;
+	}
+}
+
 static void send_nonce(struct pc_data *pcd, cl_uint nonce)
 {
 	dev_blk_ctx *blk = &pcd->work->blk;
@@ -212,6 +259,8 @@ static void send_nonce(struct pc_data *pcd, cl_uint nonce)
 			applog(LOG_DEBUG, "No best_g found! Error in OpenCL code?");
 		hw_errors++;
 		thr->cgpu->hw_errors++;
+		applog(LOG_ERR, "Nonce reported as %d but not found!", nonce);
+		find_nonce(pcd);
 	}
 }