From mboxrd@z Thu Jan 1 00:00:00 1970 From: Przemyslaw Marczak Date: Wed, 19 Nov 2014 20:26:52 +0100 Subject: [U-Boot] [PATCH v1 1/2] odroid: Update README with USB host information In-Reply-To: References: <1416414090-4058-1-git-send-email-suriyan.r@gmail.com> <546CD5E6.5010605@samsung.com> <546CE42B.1010706@samsung.com> Message-ID: <546CEEFC.2060701@samsung.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hello, On 11/19/2014 07:47 PM, Suriyan Ramasami wrote: > Hello Przemyslaw, > > On Wed, Nov 19, 2014 at 10:40 AM, Przemyslaw Marczak > wrote: >> Hi, >> >> >> On 11/19/2014 07:29 PM, Suriyan Ramasami wrote: >>> >>> Hello Przemyslaw, >>> >>> On Wed, Nov 19, 2014 at 9:39 AM, Przemyslaw Marczak >>> 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 >>>>> --- >>>>> >>>>> 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 >> >> >> Yes, this will be full enough, but I'm not sure if those both cases will not >> require additional environment variables, like setting special bootargs? >> > I shall go through the whole setup including bootarg changes if any to > accomplish the said method of booting. > For example I could walk through an example of just getting ping to work: > > Odroid # usb start > (Re)start USB... > USB0: USB EHCI 1.00 > scanning bus 0 for devices... 3 USB Device(s) found > scanning usb for storage devices... 0 Storage Device(s) found > scanning usb for ethernet devices... 1 Ethernet Device(s) found > Odroid # setenv autoload no > Odroid # setenv usbethaddr 02:de:ad:be:ef:ff > Odroid # dhcp > Waiting for Ethernet connection... done. > BOOTP broadcast 1 > DHCP client bound to address 192.168.1.10 (507 ms) > Odroid # ping 192.168.1.1 > Waiting for Ethernet connection... done. > Using sms0 device > host 192.168.1.1 is alive > Odroid # > > And go on from there to get tftp loading the linux kernel etc. > > Thanks > - Suriyan > That's great. And if you have a time for it, then you could add required changes to CONFIG_EXTRA_ENV_SETTINGS or if no, then the above example of usage is also helpful. >>> >>> Thanks >>> - Suriyan >>> >>>> Best regards, >>>> -- >>>> Przemyslaw Marczak >>>> Samsung R&D Institute Poland >>>> Samsung Electronics >>>> p.marczak at samsung.com >>> >>> >> >> Thank you, >> >> -- >> Przemyslaw Marczak >> Samsung R&D Institute Poland >> Samsung Electronics >> p.marczak at samsung.com > Best regards, -- Przemyslaw Marczak Samsung R&D Institute Poland Samsung Electronics p.marczak at samsung.com