This message was posted on behalf of Intel Corporation
Thank you for contacting Intel Customer Support.
You’ve posted your question in the Galileo community. The Quark X1000 is not in the scope of this team but, we’d gladly point you in the right direction. The link to open a service ticket and receive support from the Quark X1000 experts is the following: premiersupport.intel.com .
Anyhow, we reviewed this case and believe we can offer some advice on what to consider for your project. The following documents have useful information about the supported configurations of the PCIe root ports, design considerations and more.
Quark PDG (Section 4): https://www-ssl.intel.com/content/dam/www/public/us/en/documents/guides/quark-x1000-platform-design-guide.pdf
Quark UEFI Firmware Writers Guide (Section 13): https://www.intel.com/content/www/us/en/embedded/products/quark/quark-x1000-uefi-firmware-writers-guide.html
Please review these documents and see some of the capabilities of the Quark x1000.
We hope this information helps you. If you need further assistance, please contact the Quark x1000 team, they’ll be able to provide much detailed information on the matter. Have a nice day.