<html><body><p><font size="2">Have you attempted to get a complete scom trace from the original Hostboot code and compare it to your new code? That is a pretty typical debug strategy on our side when migrating from the initial hardware bringup scripts into the firmware implementation.</font><br><font size="2"><br>--<br>Dan Crowell<br>Senior Software Engineer - Power Systems Enablement Firmware<br>IBM Rochester: t/l 553-2987<br>dcrowell@us.ibm.com</font><br><br><img width="16" height="16" src="cid:1__=09BB0C3CDFDF45C48f9e8a93df938690918c09B@" border="0" alt="Inactive hide details for Krystian Hebel ---04/06/2021 07:45:26 AM---Update: I have dealt with write leveling issue, I accident"><font size="2" color="#424282">Krystian Hebel ---04/06/2021 07:45:26 AM---Update: I have dealt with write leveling issue, I accidentally shifted a bit twice when trying to s</font><br><br><font size="2" color="#5F5F5F">From: </font><font size="2">Krystian Hebel <krystian.hebel@3mdeb.com></font><br><font size="2" color="#5F5F5F">To: </font><font size="2">Daniel M Crowell <dcrowell@us.ibm.com></font><br><font size="2" color="#5F5F5F">Cc: </font><font size="2">firmware@3mdeb.com, openpower-firmware@lists.ozlabs.org</font><br><font size="2" color="#5F5F5F">Date: </font><font size="2">04/06/2021 07:45 AM</font><br><font size="2" color="#5F5F5F">Subject: </font><font size="2">[EXTERNAL] Re: [OpenPower-Firmware] Problem with CCS</font><br><hr width="100%" size="2" align="left" noshade style="color:#8091A5; "><br><br><br><font size="1" color="#FFFFFF">Update: I have dealt with write leveling issue, I accidentally shifted a bit twice when trying to set PAR_A17_MASK in SEQ_CONTROL0, so it was left unmasked. Now I'm back to initial issue with loop in CCS. This time however I see a difference ZjQcmQRYFpfptBannerStart</font> <br><b><font face="Arial">This Message Is From an External Sender </font></b><br><font size="2" face="Arial">This message came from outside your organization. </font><br><font size="1" color="#FFFFFF">ZjQcmQRYFpfptBannerEnd</font><p>Update: I have dealt with write leveling issue, I accidentally shifted a bit twice when trying to set PAR_A17_MASK in SEQ_CONTROL0, so it was left unmasked.
<p>Now I'm back to initial issue with loop in CCS. This time however I see a difference between original code (refresh on):
<p> 0x0000000000000000 - APB_ERROR_STATUS0<br> 0x0000000000001000 - RC_ERROR_STATUS0<br> 0x0000000000000000 - SEQ_ERROR_STATUS0<br> 0x0000000000000000 - WC_ERROR_STATUS0<br> 0x0000000000000400 - PC_ERROR_STATUS0<br> 0x0000000000002008 - PC_INIT_CAL_ERROR<br> 0x0000000000000688 - DDRPHY_PC_INIT_CAL_STATUS<br> 0x0000000000000080 - IOM_PHY0_DDRPHY_FIR_REG
<p>and after setting DDRPHY_PC_INIT_CAL_CONFIG1_P0 as in previous mail:<br><br> 0x0000000000000000 - APB_ERROR_STATUS0<br> 0x0000000000001000 - RC_ERROR_STATUS0<br> 0x0000000000000000 - SEQ_ERROR_STATUS0<br> 0x0000000000000000 - WC_ERROR_STATUS0<br> 0x0000000000000000 - PC_ERROR_STATUS0<br> 0x0000000000000000 - PC_INIT_CAL_ERROR<br> 0x0000000000000608 - DDRPHY_PC_INIT_CAL_STATUS<br> 0x0000000000000000 - IOM_PHY0_DDRPHY_FIR_REG
<p>PC_INIT_CAL_ERROR no longer reports an error, but DDRPHY_PC_INIT_CAL_STATUS still doesn't report a success. No DQ/DQS bits are disabled, neither with nor without refresh.
<p>On 06.04.2021 12:28, Krystian Hebel wrote:
<ul><ul>Hi Daniel,
<p>Thanks for quick and informative response.
<ul><ul><font size="2" face="Arial">I got these answers from one of our memory experts.</font><br><font size="2" face="Arial"> </font><br><font size="2" face="Arial">Hi Krystian,</font><ul><font size="2">1. </font><font size="2" face="Arial">IBM mostly uses x4 DIMM's. Is it possible to run with a x4 DIMM for debug purposes to see if the problem persists? This will help debug configuration issues with the x8 DIMM's</font></ul></ul></ul>This may be difficult due to remote work, but I'll see what can be done.
<ul><ul><ul><font size="2">2. </font><font size="2" face="Arial">Have you tried disabling refresh to see if the issues go away?</font></ul></ul></ul>Is it enough to just modify DDRPHY_PC_INIT_CAL_CONFIG1_P0? If yes, I changed all of REFRESH_COUNT, REFRESH_CONTROL and REFRESH_ALL_RANKS to all 0's and REFRESH_INTERVAL to all 1's. It still fails the same way, but a few microseconds faster than before.
<ul><ul><ul><font size="2">3. </font><font size="2" face="Arial">For calibration fails (which it looks like you are experiencing), I would recommend dumping the following registers for rank 0<br>DQS disable bits<br>0x8000007d0701103f<br>0x8000047d0701103f<br>0x8000087d0701103f<br>0x80000c7d0701103f<br>0x8000107d0701103f<br><br>DQ disable bits<br>0x8000007c0701103f<br>0x8000047c0701103f<br>0x8000087c0701103f<br>0x80000c7c0701103f<br>0x8000107c0701103f<br><br>If calibration is passing on a given DRAM, all of the bits should be 0's. Fails are noted by 1's in the register. As per all PHY registers only the right most 16 bits matter.</font></ul></ul></ul>Here I can see some fails: all DQ bits on first and second DP16 and all configured DQS bits (0xc300 for first and 0x3c00 for second, which is consistent with settings from [1]). The rest of DP16s passes. This DIMM works with Hostboot so I think clock bits are selected properly.
<p>I haven't thought that these are updated by a hardware and then used as an input for next steps. Now I know that what I think was a successful write leveling, was actually skipping bad bits. I was mislead by the fact that the second attempt took more time than the first one, but it makes sense, as it starts from a higher initial delay and has a longer way to go down and up again, if I understand this step correctly.
<p>I went a step further and dumped all WR_DELAY_VALUE_x_RP0_REG - for passed bits it is somewhere in range 0x1900-0x2b00, where every set of 8 DQ bits and its accompanying DQS bit have the same value, which I believe is expected for x8 memory. For failed bits this value is always 0x3a00 for DQ bits (and whatever is in DELAY_VALUE_16-22 which isn't configured as a DQS), but 0x4200 for DQS bits. Contrary to passing DP16s, these values don't change between boots. They can change slightly when I modify DDRPHY_WC_CONFIG1_P0, but still no pass.
<ul><ul><ul><font size="2">4. </font><font size="2" face="Arial">To my knowledge, there should not be an issue sending the RCW commands via i2c.</font><br><font size="2">5. </font><font size="2" face="Arial">Running in our test environment, I am seeing the following scoms for DQS align: </font><ul><font size="2" face="Arial">CRONUSDEBUG(30807) : PUTSCOM : p9n.mcbist:k0:n0:s0:p01:c1 : 070123A5 4000000000000000 # Stop CCS<br>CRONUSDEBUG(30818) : PUTSCOM : p9n.mcbist:k0:n0:s0:p01:c1 : 07012315 000000F0CC0000C0 # Configure init calibration<br>CRONUSDEBUG(30823) : PUTSCOM : p9n.mcbist:k0:n0:s0:p01:c1 : 07012335 0000000000000041 # Go to instruction 1<br>CRONUSDEBUG(30826) : PUTSCOM : p9n.mcbist:k0:n0:s0:p01:c1 : 07012316 000008F0CC000000 # don't do anything<br>CRONUSDEBUG(30831) : PUTSCOM : p9n.mcbist:k0:n0:s0:p01:c1 : 07012336 0000000000000020 # End CCS<br>CRONUSDEBUG(30839) : PUTSCOM : p9n.mcbist:k0:n0:s0:p01:c1 : 070123DB 0400000000000000 # Configure the port to run<br>CRONUSDEBUG(30848) : PUTSCOM : p9n.mcbist:k0:n0:s0:p01:c1 : 070123A5 8000000000000000 # Kick off CCS<br><br>I hope that this trace helps.</font></ul></ul></ul></ul>So, DDR_CAL_RANK in ARR1 is a number, and not a bit map of selected ranks? That was my initial understanding, but then I changed the code to treat it as a bit map. Still, fixing the code doesn't help, even though now it is identical to the trace above.
<p><p>[1] <a href="https://git.raptorcs.com/git/talos-hostboot/tree/src/import/chips/p9/procedures/hwp/memory/lib/phy/dp16.C#n1963"><u><font color="#0000FF">https://git.raptorcs.com/git/talos-hostboot/tree/src/import/chips/p9/procedures/hwp/memory/lib/phy/dp16.C#n1963</font></u></a><br><tt>-- <br>Krystian Hebel<br>Firmware Engineer<br></tt><a href="https://3mdeb.com"><tt><u><font color="#0000FF">https://3mdeb.com</font></u></tt></a><tt> | @3mdeb_com</tt></ul></ul><tt>-- <br>Krystian Hebel<br>Firmware Engineer<br></tt><a href="https://3mdeb.com"><tt><u><font color="#0000FF">https://3mdeb.com</font></u></tt></a><tt> | @3mdeb_com</tt><br><br><BR>
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