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The Seagate Expansion Portable Drive HDD (idVendor=0bc2, idProduct=2321) is reported to fail to work on rockchip platforms with the following error message when do read/write operation by dd command: xhci-hcd xhci-hcd.11.auto: Ring expansion failed According to tkaiser's suggestion[1], we can try to increase the kernel's coherent-pool memory size to fix this issue. The kernel coherent-pool memory size was limited at 256KB by default. When set the DEFAULT_DMA_COHERENT_POOL_SIZE to 1MB, the error "Ring expansion failed" can be fixed, but it still not work with the other error message: xhci-hcd xhci-hcd.12.auto: ERROR Unknown event condition 34 for slot 1 ep 3 , HC probably busted sd 0:0:0:0: [sda] tag#16 uas_eh_abort_handler 0 uas-tag 17 inflight: CMD OUT ... scsi host0: uas_eh_bus_reset_handler start xhci-hcd xhci-hcd.12.auto: ERROR Transfer event for disabled endpoint slot 1 ep 6 or incorrect stream ring Falling back to USB mass storage can solve this problem, so ignore UAS function of this HDD. [1] https://forum.armbian.com/topic/4811-uas-mainline-kernel-coherent-pool-memory-size/ Change-Id: I0d817cc3aaea548c2060b323c3077c6cbbd3bb6e Signed-off-by: William Wu <william.wu@rock-chips.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.