# Samples and known issues

Source: [https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html](https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html)

## Sample testing

Source: [https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html](https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html)

### Engineering samples (ES)

Source: [https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html](https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html)

These devices undergo limited testing and sometimes have significant feature limitations.
            They are suitable to assist with PCB development, to conduct board-level electrical
            evaluation tests, and to explore manufacturing considerations. Engineering samples
            should not be used for product-level qualification.

### Commercial samples (CS)

Source: [https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html](https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html)

These devices undergo full production-level testing, and meet the specifications and
            features described in the device specification, except as otherwise noted in this
            document. They have passed device-level qualification. Commercial samples are suitable
            for performance testing, and also for product-level production and qualification.

## Known issues

Source: [https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html](https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html)

### Summary of known issues

Source: [https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html](https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html)

All known issues for each revision of the QCC743/QCC744 device are summarized
            in Table : Known issues – all sample types and revisions. The text within the Issue column provides links
            to the sections of this document that explain the issues, regardless of the sample type
            (or types) on which they occur. An X in one or more of the sample type columns indicates
            that the issue occurs in the corresponding sample type.

The following information is provided for each issue:

- Issue description
- Impact to system performance
- Possible workarounds to minimize impact

Table : Known issues – all sample types and revisions

| Issue # | Issue description | Workaround | QCC743-1 CS (PRR=100, 101)<br><br>QCC744-2 CS (PRR=200, 201) |
| --- | --- | --- | :---: |
| Issue 1 | DMA accesses to the XIP address space across a 32‑byte boundary<br>                            result in a read data error. | Software workaround | X |
| Issue 2 | E907 hangs if prefetch data from an uninitialized PSRAM | Default software | X |

### Issues – description, impact, and workaround

Source: [https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html](https://docs.qualcomm.com/doc/80-WL743-1/topic/samples-and-known-issues.html)

### Issue 1

| Description | DMA accesses to the XIP address space across a 32‑byte boundary<br>                                result in a read data error. |
| --- | --- |
| Impact | Result data error |
| Workaround | Software workaround:<br><ul class="ul" id="issues-description-impact-and-workaround__ul_v3p_rq1_p1c"><br>                                    <li class="li">User must ensure 32‑byte alignment when DMA accesses the XIP<br>                                        address.</li><br><br>                                    <li class="li">DMA INCx set to INC1 (INCx, x indicates the number of<br>                                        transfers).</li><br><br>                                </ul> |

### Issue 2

| Description | E907 hangs if prefetch data from an uninitialized pSRAM |
| --- | --- |
| Impact | System hang |
| Workaround | Default software:<br><ul class="ul" id="issues-description-impact-and-workaround__ul_acm_wq1_p1c"><br>                                    <li class="li">Use pmp/TZ to protect pSRAM addresses early in the chip's<br>                                        boot process.</li><br><br>                                    <li class="li">If pSRAM is initialized after system startup, it will<br>                                        unprotect this address segment.</li><br><br>                                </ul> |

Last Published: Apr 22, 2026

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