Hello Przemyslaw, On Wed, Nov 19, 2014 at 9:39 AM, Przemyslaw Marczak <p.marc...@samsung.com> wrote: > Hello, > > On 11/19/2014 05:21 PM, Suriyan Ramasami wrote: >> >> Add information wrt the USB host side of things for the Odroid-U2/U3 and >> the >> Odroid-X/X2 >> >> Signed-off-by: Suriyan Ramasami <suriya...@gmail.com> >> --- >> >> Changes in v1: >> - Add USB host notes for the Odroid >> >> doc/README.odroid | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ >> 1 file changed, 48 insertions(+) >> >> diff --git a/doc/README.odroid b/doc/README.odroid >> index 528bb95..0eaf3ff 100644 >> --- a/doc/README.odroid >> +++ b/doc/README.odroid >> @@ -141,3 +141,51 @@ And the boot sequence is: >> - boot_fit - if "Image.itb" exists >> - boot_zimg - if "zImage" exists >> - boot_uimg - if "uImage" exists >> + >> +11. USB host support >> +==================== >> +The Odroid-X/X2 have the below schematics wrt USB: >> + >> +Exynos USB_HOST1 -> USB3503 HUB ----> LAN9514 USB HUB -----> LAN9514 >> Ethernet >> + | | >> + | +-------Host1---------> USB port >> + | | >> + | +-------Host2---------> USB port >> + | | >> + | +-------Host3---------> USB port >> + | | >> + | +-------Host4---------> USB port >> + | >> + +-------------------------------------> USB port >> + | >> + +-------------------------------------> USB port >> + >> +The Odroid-U2/U3 have the below schematics wrt USB: >> + >> +Exynos HSIC1 -----------------------------------------------> LAN9514 >> Ethernet >> + >> +Exynos HSIC2 -----> USB3503A HUB ---------------Host1---------> USB port >> + | >> + +-----------------------Host2---------> USB port >> + | >> + +-----------------------HOst3---------> USB port >> (U3) >> + >> +The HSICs are used in the case of the Odroid-Us and the USB Host in the >> SoC >> +is used in the case of the Odroid-Xs. >> + >> +In drivers/usb/host/ehci-exynos.c, function names starting with >> exysno4412* >> +have been added to initialize the HSICs and the PHYs. >> + >> +In board/samsung/odroid/odroid.c, function board_usb_init() adds code to >> +initialize the USB3503 hub. >> +The initializing of the USB3503 hub is as defined in the USB3503A spec >> sheet. >> +Please refer to Figure 4.1 in the Datasheet. >> +a) Set the INT_N (X30) low (Odroid-Us) or high (Odroid-Xs). This is so >> that the >> +correct REFCLK frequency is selected. 24MHz for Odroid Us and 26MHz for >> Odroid >> +Xs. >> +b) Disconnect the HUB (Set HUB_CONNECT (X34) to 0) >> +c) Reset the HUB (Set RESET_N (X35) to 0 and then to 1) >> +d) HUB waits for REF_CLK (which we have set appropriately) >> +e) Timeout waiting for HUB configuration stage >> +f) Connect the HUB (Set HUB_CONNECT (X34) to 1) >> +g) Power recycle the LAN9730 which is connected to BUCK8 (Odroid Us) >> > > Suriyan, you quite misunderstand my intention. You added really useful part > of code - now user can read/write data to USB mass storage or boot over the > Ethernet. Probably you are using this feature. And this is a usage of the > USB for the user. > > For the user - it's not important how it works in the hardware - I would > like to get some simple instructions, e.g. How to boot Odroid over the > Ethernet, or how to write data to USB stick. I believe that users read this > documentation when they starting use of Odroid with the mainline U-Boot, and > a description of another boot option is welcome here. > It should be "How to start with this board", rather than how to develop USB > hub driver on it. >
Ah! I see. You are right, I totally misunderstood you. I shall get rid of the hardware part of things, and add the sections that you have mentioned, viz: - How to boot Odroid over Ethernet - How to boot Odroid over USB storage etc Thanks - Suriyan > Best regards, > -- > Przemyslaw Marczak > Samsung R&D Institute Poland > Samsung Electronics > p.marc...@samsung.com _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
