[U-Boot] [PATCH v3 19/19] sunxi: update Pine64 README

[Andreas Färber]

Hi Andre,

Thanks for your awesome work on getting things in shape!

Am 01.04.2017 um 00:31 schrieb Andre Przywara:
> +Quick Start / Overview
> +======================
> +- Build the ARM Trusted Firmware binary (see "ARM Trusted firmware (ATF)" below)
> +- Build U-Boot (see "SPL/U-Boot" below)
> +- Transfer to an uSD card (see "microSD card" below)
> +- Boot and enjoy!
> +
> +Building the firmware
> +=====================
> +
> +The Allwinner A64 firmware consists of three parts: U-Boot's SPL, an
> +ARM Trusted Firmware (ATF) build and the U-Boot proper.
> +The SPL will load both ATF and U-Boot proper along with the right device
> +tree blob (.dtb) and will pass execution to ATF (in EL3), which in turn will
> +drop into the U-Boot proper (in EL2).
> +As the ATF binary will become part of the U-Boot image file, you will need
> +to build it first.
> +
> + ARM Trusted firmware (ATF)

"Firmware"

> +----------------------------
> +Checkout the "allwinner" branch from the github repository [1] and build it:
> +$ export CROSS_COMPILE=aarch64-linux-gnu-
> +$ make PLAT=sun50iw1p1 DEBUG=1 bl31
> +  The resulting binary is build/sun50iw1p1/debug/bl31.bin. Copy this to the
> +  root of the U-Boot source tree (or create a symbolic link).

This sentence startled me - but luckily it does not need to be in the
_source_ directory, the U-Boot _build_ directory works just fine, too!
Care to revise the statement?

It would also be nice to be able to just set some BL31 variable with the
full path on the make command line, like ATF allows.

> +
> + SPL/U-Boot
> +------------
> +Both U-Boot proper and the SPL are using the 64-bit mode. As the boot ROM
> +enters the SPL still in AArch32 secure SVC mode, there is some shim code to
> +enter AArch64 very early. The rest of the SPL runs in AArch64 EL3.
> +U-boot proper runs in EL2 and can load any AArch64 code, EFI applications or

"U-Boot"

> +arm64 Linux kernel images (often named "Image") using the booti command.

You may want to clarify this sentence - booti only applies to the
latter, EFI applications would use "bootefi" and arbitrary code "go".
Maybe just drop the "using" part?

> +
> +$ make clean
>  $ export CROSS_COMPILE=aarch64-linux-gnu-
>  $ make pine64_plus_defconfig
>  $ make
[snip]

Build-testing this series with both pine64_plus_defconfig and
orangepi_pc2_defconfig, I ran into a ~1616 size overflow with gcc5. gcc6
worked okay. Would be helpful to document such requirements here.

For the Orange Pi PC 2, for this series:

Tested-by: Andreas Färber <afaerber at suse.de>

Orange Pi PC 2 will benefit from the $fdtfile patch I sent for Pine64,
tested there as well.

I note there is no README.orangepi_pc2. Should README.pine64 be renamed
to cover both boards, or were you planning to add a separate one?

Reason I ask is I tried unsuccessfully the Pine64 boot0.bin approach
(based on your extract_fw_blobs.sh) for orangepi_pc2 before, based on
current master branch, and it did not get me into U-Boot, unlike on the
Pine64, so some documentation somewhere would be good to have,
especially should this simplifying patchset miss the release again...

HELLO! BOOT0 is starting!
boot0 commit : 8
boot0 version : 4.0
set pll start
set pll end
rtc[0] value = 0x00000000
rtc[1] value = 0x00000000
rtc[2] value = 0x00000000
rtc[3] value = 0x00000000
rtc[4] value = 0x00000000
rtc[5] value = 0x00000000
DRAM BOOT DRIVE INFO: V0.6
the chip id is 0x00000001
the chip id is 0x00000001
the chip id is 0x00000001
the chip id is 0x00000001
the chip id is 0x00000001
axp not exist
DRAM CLK =672 MHZ
DRAM Type =3 (2:DDR2,3:DDR3,6:LPDDR2,7:LPDDR3)
DRAM zq value: 0x003b3bf9
DRAM SIZE =1024 M
DRAM simple test OK.
dram size =1024
card no is 0
sdcard 0 line count 4
[mmc]: mmc driver ver 2016-03-15 20:40
[mmc]: sdc0 spd mode error, 2
[mmc]: Wrong media type 0x00000000
[mmc]: ***Try SD card 0***
[mmc]: HSSDR52/SDR25 4 bit
[mmc]: 50000000 Hz
[mmc]: 30436 MB
[mmc]: ***SD/MMC 0 init OK!!!***
PANIC : sunxi_flash_init() error --2--,toc1 magic error
PANIC : sunxi_flash_init() error --2--,toc1 magic error
PANIC : sunxi_flash_init() error --0--
Ready to disable icache.

Possibly related is that the output from boot0img was significantly
larger than for Pine64? (same bl31.bin, other boot0.bin and u-boot.bin)

$ filesize orangepipc2.img
20013056
$ filesize pine64.img
499712

Searching for a how-to I also noticed that linux-sunxi.org still links
to a stale h5 branch from December (and that there is an spl-fit-v2
branch but none with the latest v3 code ;)).

Cheers,
Andreas

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