On 29/03/2019 11:26, Michal Simek wrote:
On 29. 03. 19 11:13, Jean-Jacques Hiblot wrote:
On 28/03/2019 14:54, Michal Simek wrote:
On 25. 03. 19 9:08, Michal Simek wrote:
On 22. 03. 19 15:39, Jean-Jacques Hiblot wrote:
The purpose of this series is to provide the SPL with ability to apply
overlays for u-boot. this is only a RFC so far, to get a feedback on
the
approach.
Our use-case is the support of the daughter boards of the AM65x EVM. In
Linux, each board is supported by a unique overlay. The presence of the
boards is detected at runtime, and some useful features (like USB) are
implemented on those daughter boards. Instead of providing multiple
dtbs
and fall in a combinatorial pit, we propose to use DT overlays.
Not sure if you have it on these boards too but I expect you are able to
detect base board with this code board/ti/common/board_detect.c
How do you detect these daughter cards? Is there additional I2C
connection to them and they have on board eeprom with any format for
detection?
Yes. There is EEPROM and GPIOs involved in the detection process.
Does that mean that you use gpio bitbanging i2c eeprom to read information?
no, on am65 we use GPIOs and a true I2C to detect the daughter boards
x
Something similar what it is part of FMC standard/VITA 57.1 with using
FRU spec for daughter card description?
Anyway we are working on FRU parser exactly for this purpose.
Do you also need to apply that overlays in SPL?
We need to apply in SPL so that u-boot has the right information in the DT.
Isn't it enough to apply them as the part of board_fdt_blob_setup()?
No it's possible to do that in board_fdt_blob_setup().
A little bit confused by your response. yes/no?
I forgot a key word here. it is not possible. board_fdt_blob_setup is
used to provide a DTB blob
I see v2 now but without answering my questions here.
Yes I had prepared the answer and forgot to push the send button.
in the V2 the biggest change is when the list of additional images is
obtained from the board. It is now in spl_fit_get_image_name() and that
makes its usable for other kind of binaries than just overlays.
Yes I have seen that. Give me some time to test this.
As I said V2 looks better.
M
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