Re: Question about extension board used in U-boot

2021-09-21 Thread Ying-Chun Liu (PaulLiu)
Hi Heinrich, I think I met some chicken and egg problem. Or I misunderstand something you mentioned. So I tried board_fdt_blob_setup() and board_fix_fdt(). Both are too early. I need i2c to be drived first. And then I can use dm_i2c_probe() on different address to detect which extension board

Re: Modules for carrier boards [Was: Re: Question about extension board used in U-boot]

2021-09-20 Thread François Ozog
Le lun. 20 sept. 2021 à 13:32, Daniel Thompson a écrit : > On Sat, Sep 18, 2021 at 08:49:48AM +0200, François Ozog wrote: > > Hi Paul > > > > Too posting because I think we also need to address this at a higher > level. > > > > i think we discussed this topic quite a while back. I may be wrong

Modules for carrier boards [Was: Re: Question about extension board used in U-boot]

2021-09-20 Thread Daniel Thompson
On Sat, Sep 18, 2021 at 08:49:48AM +0200, François Ozog wrote: > Hi Paul > > Too posting because I think we also need to address this at a higher level. > > i think we discussed this topic quite a while back. I may be wrong but it > may be Bill Mills who proposed to have an eeprom on the

Re: Question about extension board used in U-boot

2021-09-18 Thread Heinrich Schuchardt
On 9/18/21 8:54 AM, François Ozog wrote: Le sam. 18 sept. 2021 à 08:49, François Ozog a écrit : Hi Paul Too posting because I think we also need to address this at a higher level. i think we discussed this topic quite a while back. I may be wrong but it may be Bill Mills who proposed to

Re: Question about extension board used in U-boot

2021-09-18 Thread François Ozog
Le sam. 18 sept. 2021 à 08:49, François Ozog a écrit : > Hi Paul > > Too posting because I think we also need to address this at a higher level. > > i think we discussed this topic quite a while back. I may be wrong but it > may be Bill Mills who proposed to have an eeprom on the extensions that

Re: Question about extension board used in U-boot

2021-09-18 Thread François Ozog
Hi Paul Too posting because I think we also need to address this at a higher level. i think we discussed this topic quite a while back. I may be wrong but it may be Bill Mills who proposed to have an eeprom on the extensions that the carrier board can use to detect and fetch proper overlay.

Question about extension board used in U-boot

2021-09-17 Thread Ying-Chun Liu (PaulLiu)
Hi all, I have some questions about how to implement extension board usage. My case is on imx8mm-cl-iot-gate. It can add three different types of extension boards. One of the extension boards is SPI extension which have 3 empty slots. And you can add some small boards onto it. One of them is a