[U-Boot] [PATCH] usb: ehci: add ehci max xfer size ehci config entry

Gilles Doffe gilles.doffe at savoirfairelinux.com
Wed Nov 13 08:58:37 UTC 2019

----- Le 28 Oct 19, à 23:46, Marek Vasut marex at denx.de a écrit :

> On 10/28/19 6:35 PM, Robert Hancock wrote:
>> On 2019-10-25 8:30 a.m., Gilles DOFFE wrote:
>>> Some USB sticks cannot handle SIZE_MAX bytes (65535) blocks transfer,
>>> leading to 'EHCI timed out on TD' errors.
>>> As it is hardly predictable, this commit adds a configuration option
>>> to easily reduce this EHCI max transfer size. The default value is 65535
>>> which corresponds to size_t max value (SIZE_MAX).
>> This doesn't seem like an ideal solution, as one would have to rebuild
>> U-Boot to cope with such a device. Do you know how the Linux kernel EHCI
>> driver deals with this problem?
> I presume this is already fixed in u-boot-usb/next by:
> https://gitlab.denx.de/u-boot/custodians/u-boot-usb/commit/78d49f89e1dd9bdfa891389343bc3016bcaaeee4
> https://gitlab.denx.de/u-boot/custodians/u-boot-usb/commit/b43c016256a5eb1070fbca24309e0e66590b7771
> https://gitlab.denx.de/u-boot/custodians/u-boot-usb/commit/4bf7e8b7ad6231cf161fcf95d5c3cc6f1de9fff9

Indeed it could solve the problem.
I was not aware of this repo, so I missed it.
Thanks for pointing me on it. I'll give it a try.

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