Am 20.12.2018 um 15:49 schrieb Simon Glass:
Hi Simon,
On Wed, 19 Dec 2018 at 14:06, Simon Goldschmidt
<simon.k.r.goldschm...@gmail.com> wrote:
Hi,
while searching for bytes to save in SPL in order to add FIT signature
handling, I am currently trying to get socfpga-gen5 to use OF_PLATDATA.
To begin, I stripped down socfpga_socrates_defconfig to absolutely
nothing but serial drivers in SPL (with some modifications to the
Kconfig) and enabled DEBUG_UART to see what's going on.
Now while this config runs OK with a dtb (it just won't boot as drivers
are missing -> "failed to boot from all boot devices"), it does not find
the serial driver after enabling OF_PLATDATA.
So since serial_rockchip.c already uses OF_PLATDATA and is based on
ns16550 that my socfpga-gen5 platform is using: what do I have to do
besides enabling OF_PLATDATA to get this working?
I just seems like uclass_first_device does not find any UCLASS_SERIAL
deivce when OF_PLATDATA is enabled.
There is the of-plat.txt README.
Yes, I should have mentioned I already read that and still had those
questions. Kconfig help says README.platdata though. We probably should
update that link.
Basically the dtoc tool creates U_BOOT_DEVICE() declarations and links
them with SPL. These should show up in your image and therefore be
bound. You can call dm_dump_all() in SPL to see what what devices are
bound. I presume you are calling spl_init()?
You can look at what dtoc produces. The example serial driver for
Rockchip is serial_rockchip.c
I saw that as an example (because I also have an ns16550 compatible on
my board) but couldn't figure out why it is not bound. By debugging
'dm_scan_platdata', 'lists_bind_drivers' and 'device_bind_by_name', by
now I know the driver names don't match. That is something I did not get
just by reading of-plat.txt. I'll work on a patch to clarify that document.
Right now, serial works. I had to add a new platform specific driver
just like serial_rockchip though. For DTS, we can pass multiple
'compatible' strings, but for platdata, we have to create multiple
drivers. That's a bit strange when porting boards...
(And when answering this, keep in mind I need to get MMC and QSPI
drivers working with OF_PLATDATA - I already fixed compiler errors in
those, nothing more.)
Yes MMC should be OK, but QSPI might be blazing a bit of a trail.
I just wanted to start with QSPI, maybe I'll do MMC first now ;-)
Thanks for your hints!
Regards,
Simon
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