Hello Lukasz, Thanks for your response. I guess I was not very clear with my question.
u-boot code already exists for the odroid-u2 (that is what it uses). Unfortunately, it does not have USB support. I am looking at just adding the EHCI and USB (uses a 3503A) part of the code.
I checked the TRATS2 patch and it too does not have any code that touches the USB part of things.
Thanks - Suriyan
On Sun, Jul 7, 2013 at 11:56 PM, Lukasz Majewski l.majewski@samsung.comwrote:
On Sun, 07 Jul 2013 02:15:17 -0700, Suriyan Ramasami wrote:
Hi Suriyan,
Hi wonderful folks!
I own an odroid-u2 and the u-boot that comes with it does nothave usb support. Its configuration is smdk4412 and I do not find that in the u-boot sources. I see it in the arndale and harkernel branches.
I do see that usb support was added to the arndale platform - which is exynos5 based. Is it easy to port it for exynos4412?
Patches for Exynos4412 based board (TRATS2) were already sent on the mailing list:
http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/161578/match=introduc...
Please refer to them. It shall be relatively easy to add odroid-u2 support based on TRATS2.
I did try it porting on my own accord and am listing it below...
I seem to be hitting issues in drivers/usb/host/ehci-exynos.c -> function setup_usb_phy(struct exynos_usb_phy *usb). Would passing the correct address of usb for the exynos4412 do the trick? If so what should it be? In this same file ehci_hcd_init() uses gpio->x3 and gpio->d1. In exynos4 looks like x3 is from gpio_part2. Also, do the d1 and x3 translate to the same gpiod1 and gpiox3 in the exynos4412?
Furthermore, ehci-exynos.c uses functions from arch/arm/cpu/armv7/exynos/system.c which for the most part are exynos5 oriented and do nothing for exynos4.
Can someone guide me as to what I could do, or some pointers to helpful docs? I do have the Exynos 4412 user manual.
Thanks
- Suriyan
-- Best regards,
Lukasz Majewski
Samsung R&D Institute Poland (SRPOL) | Linux Platform Group