[U-Boot] Custom SPL for im.X6UL

[Peng Fan]

> -----Original Message-----
> From: U-Boot [mailto:u-boot-bounces at lists.denx.de] On Behalf Of Araya,
> Jose
> Sent: 2019年3月9日 0:59
> To: u-boot at lists.denx.de
> Subject: [U-Boot] Custom SPL for im.X6UL
> 
> Hello everyone,
> 
> I would like to ask what would be a good starting point to have a custom
> multi-stage booting for the NXP i.mx6UL processor?
> 
> Basically I need to be able to configure an FPGA before the U-Boot is executed.
> The reason for that is that the PGA must be configured so that the im6UL can
> have a physical connection to the DRAM. To clarify:
> 
> 
> -       In the circuit, the DRAM will be multiplexed by an FPGA. If the FPGA
> is not configured, the imx6UL has no access to the DRAM.
> 
> -       The imx6UL has a direct SPI connection to the flash and to the FPGA,
> so all I need is to take the bitstream from a given location in the FLASH and
> load it into the FPGA, then just wait for a flag (GPIO?) saying that the FPGA
> was successfully configured and keep the booting process in the processor as
> normal.
> 
> 
> As I haven't done yet anything similar, just wanted to know if you have any
> recommendations regarding where to start and some  hints to proceed.

SPL might help here, because it runs in OCRAM.

Regards,
Peng.

> 
> Thanks in advance!
> 
> Bests,
> 
> Jose Moises
> 
> 
> 
> 
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