[SeaBIOS] USB-to-SATA bridge conflicts with USB boot flash drive

Paul Menzel pmenzel at molgen.mpg.de
Tue Dec 18 15:20:32 CET 2018

Dear Aladyshev,

On 12/18/18 15:15, Аладышев Константин wrote:

> I use coreboot+SeaBIOS bundle on custom motherboard with Intel Haswell i7
> and Lynxpoint-LP chipset and I've come to a strange issue with USB-to-SATA
> bridge TUSB9261 (http://www.ti.com/product/TUSB9261).
> In my experiments I plug HDD to one USB port, and USB boot flash drive to
> another USB port.
> Everything works fine when HDD is present on USB-to-SATA bridge. SeaBIOS
> displays both devices in its boot menu. But if HDD is not present and if USB
> boot flash drive is plugged to a port greater than USB-to-SATA bridge port,
> SeaBIOS doesn't see flash drive as bootable device.
> In this case I see in log messages similar to this:
> """
> Searching bootorder for: /pci at i0cf8/usb at 1d/hub at 1/storage at 7/*@0/*@0,0
> Searching bootorder for: /pci at i0cf8/usb at 1d/hub at 1/usb-*@7
> ehci_send_pipe qh=0x000eab80 dir=0 data=0x00006b79 size=31
> ehci_send_pipe qh=0x000eab00 dir=128 data=0x00006c98 size=36
> WARNING - Timeout at ehci_wait_td:516!
> ehci pipe=0x000eab00 cur=000069c0 tok=80240d80 next=1 td=0x000069c0
> status=240d80
> USB transmission failed
> Unable to configure USB MSC drive.
> phys_free f4950 (detail=0x7f6c13c0)
> Unable to configure USB MSC device.
> """
> Summarizing all the above with SeaBIOS logs:
> SeaBIOS displays flash drive correctly as bootable device when:
> - HDD is present on SATA-to-USB port (https://pastebin.com/SuKBkQrq)
> - HDD is not present on USB port, but SATA-to-USB port number is greater
> than USB flash drive number (https://pastebin.com/9f6RTBHB)
> SeaBIOS doesn't display flash drive as bootable device when:
> - HDD is not present on USB port and SATA-to-USB port number is less than
> USB flash drive number (https://pastebin.com/abBPhej0)
> What can be the source of the problem and what can I do to solve this issue?

Without looking at the code, can you come up with an example for QEMU
to reproduce this?

Kind regards,


PS: Please attach the logs in the future, so reading the mail one does
not need to be online.

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