From 8eb221deafcdba4311979e09020335b3cc4722f5 Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Mon, 7 Mar 2016 14:30:47 -0600 Subject: [PATCH] nb/amd/mct_ddr3: Properly initialize arrays and add bounds checks A couple of arrays were not properly initialized. This did not appear to affect operation of the codebase however it led to some ugly values being displayed when debugging was turned on. Also bounds check an array index; as before this did not appear to affect operation but was a potential point of failure. Change-Id: I243b7197a74aed78ddca808eb3b0f35f1fe9d95a Signed-off-by: Timothy Pearson Reviewed-on: https://review.coreboot.org/13934 Tested-by: build bot (Jenkins) Tested-by: Raptor Engineering Automated Test Stand Reviewed-by: Martin Roth --- src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c index 1a3c7c1aa6..8d7ff27105 100644 --- a/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c +++ b/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c @@ -1717,6 +1717,7 @@ static void TrainDQSReceiverEnCyc_D_Fam15(struct MCTStatStruc *pMCTstat, /* 2.10.5.8.3 */ Receiver = mct_InitReceiver_D(pDCTstat, dct); + /* Indicate success unless training the DCT explicitly fails */ dct_training_success = 1; /* There are four receiver pairs, loosely associated with chipselects. @@ -1729,8 +1730,9 @@ static void TrainDQSReceiverEnCyc_D_Fam15(struct MCTStatStruc *pMCTstat, continue; } - for (lane = 0; lane < MAX_BYTE_LANES; lane++) - lane_training_success[lane] = 0; + /* Initialize variables */ + memset(lane_training_success, 0, sizeof(lane_training_success)); + memset(current_phy_phase_delay, 0, sizeof(current_phy_phase_delay)); /* 2.10.5.8.3 (2) */ read_dqs_receiver_enable_control_registers(initial_phy_phase_delay, dev, dct, dimm, index_reg); @@ -1792,14 +1794,17 @@ static void TrainDQSReceiverEnCyc_D_Fam15(struct MCTStatStruc *pMCTstat, #endif /* 2.10.5.8.3 (5) */ - prev = 0; - for (current_phy_phase_delay[lane] = rx_en_offset; current_phy_phase_delay[lane] < 0x3ff; current_phy_phase_delay[lane] += ren_step) { + prev = dqs_results_array[rx_en_offset]; + for (current_phy_phase_delay[lane] = rx_en_offset + ren_step; current_phy_phase_delay[lane] < 0x3ff; current_phy_phase_delay[lane] += ren_step) { if ((dqs_results_array[current_phy_phase_delay[lane]] == 0) && (prev == 1)) { /* Restore last known good delay */ current_phy_phase_delay[lane] -= ren_step; /* 2.10.5.8.3 (5 A B) */ - current_phy_phase_delay[lane] -= 0x10; + if (current_phy_phase_delay[lane] < 0x10) + current_phy_phase_delay[lane] = 0x0; + else + current_phy_phase_delay[lane] -= 0x10; /* Update hardware registers with final values */ write_dqs_receiver_enable_control_registers(current_phy_phase_delay, dev, dct, dimm, index_reg);