[U-Boot] [PATCH 0/20] tegra: Expand Nyan-big support

Sjoerd Simons
2015-03-30T08:14:22Z

On Fri, 2015-02-27 at 22:11 -0700, Simon Glass wrote:
> Hi Sjoerd,
>
> On 25 February 2015 at 17:12, Sjoerd Simons
> <sjoerd.simons@collabora.co.uk> wrote:
> > Hey Simon,
> >
> > Incidentally i got acces to a Nyan big and wanted to start testing
> > u-boot on it. Unfortunately putting a uImage in a vboot signed blob to
> > chainload it from the primary bootloader like on the exynos based
> > chromebooks seemed not to work.
> >
> > Do you have any good pointers how to use u-boot on nyan? (Ideally
> > without having to re-flash coreboot, as i would like to create images
> > people can easily test on a vanilla chromebook)
>
> No I don't sorry. I suppose in dev mode it should boot a signed image
> so if you put U-Boot in a FIT as with snow/pit it should work. But I
> don't have instructions...if you figure it out it would be good to put
> this info somewhere.

Finally got time to play a bit with this. On the snow/peach boards the
approach is to put u-boot in a legacy u-boot image (not a FIT image),
which has the nice side-effect of re-locating u-boot before jumping to
it.

Unfortunately the depthcharge on the nyan boards appears not to support
legacy images, only FIT images, which don't get relocated before jumping
into the kernel blob. Long story short, on the nyan boards the FIT image
gets loaded at 0x81000000 and the FIT images i created put the u-boot
blob at an offset of 0xCC. After re-configuring CONFIG_SYS_TEXT_BASE to
match i got u-boot starting \o/ ;)

Unfortunately the board seems to hard hang when it tries to enable/use
the data cache. Enabling CONFIG_SYS_DCACHE_OFF makes it get to the
u-boot prompt. Unfortunately neither MMC (didn't detect card) nor USB
(failed to get descriptor from my usb network dongle) worked so i
couldn't try booting a kernel just, but it's start.

Simon, does data cache/MMC/USB work properly when booting u-boot
"natively" rather then chainloading from coreboot or does it have
similar issues?

Fwiw, I've attached the output of u-boot running onthe board (with
CONFIG_SYS_DCACHE_OFF enabled).

--
Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Collabora Ltd.
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U-Boot 2015.04-rc4-00125-g662e2ac-dirty (Mar 30 2015 - 00:17:30)

TEGRA124

Model: Acer Chromebook 13 CB5-311

DRAM: 2 GiB

MMC: Tegra SD/MMC: 0, Tegra SD/MMC: 1, Tegra SD/MMC: 2

Card did not respond to voltage select!

MMC init failed

Using default environment

In: serial

Out: serial

Err: serial

Net: Net Initialization Skipped

No ethernet found.

Hit any key to stop autoboot: 2 \b\b\b 1 \b\b\b 0

MMC: no card present

Card did not respond to voltage select!

starting USB...

USB0: USB EHCI 1.10

scanning bus 0 for devices... EHCI timed out on TD - token=0x80008c80

EHCI timed out on TD - token=0x80008d80

EHCI timed out on TD - token=0x80008c80

EHCI timed out on TD - token=0x80008c80

usb_get_configuration_no: failed to get descriptor - too long: 65460

usb_new_device: Cannot read configuration, skipping device 58f4:fffa

1 USB Device(s) found

USB1: USB EHCI 1.10

scanning bus 1 for devices... 1 USB Device(s) found

scanning usb for storage devices... 0 Storage Device(s) found

scanning usb for ethernet devices... 0 Ethernet Device(s) found

USB device 0: unknown device

No ethernet found.

missing environment variable: pxeuuid

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/00000000

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/0000000

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/000000

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/00000

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/0000

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/000

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/00

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/0

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/default-arm-tegra124

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/default-arm

No ethernet found.

missing environment variable: bootfile

Retrieving file: pxelinux.cfg/default

No ethernet found.

Config file not found

No ethernet found.

Tegra124 (Nyan-big) #