Re: [U-Boot] Custom SPL for im.X6UL
Hi
-----Original Message----- From: Araya, Jose [mailto:j.araya@sensopart.de] Sent: 2019年3月11日 16:50 To: Peng Fan peng.fan@nxp.com Subject: AW: [U-Boot] Custom SPL for im.X6UL
Hi Peng,
thanks for answering! Just a follow up question:
Does the U-boot from NXP run in OCRAM or in DRAM?
For i.MX6UL, NXP released U-Boot runs from DRAM, no SPL.
I read that a multi-stage boot is faster and more efficient, that makes me think that if I use a single-stage boot it should run in OCRAM (which is limited) and that's why the multi-stage (which uses DRAM) is actually faster. That's why my question arises.
You could use the upstream uboot for i.MX6UL, it supports SPL runs from OCRAM.
Regards, Peng.
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Thanks!
Moises
-----Ursprüngliche Nachricht----- Von: Peng Fan peng.fan@nxp.com Gesendet: Samstag, 9. März 2019 02:11 An: Araya, Jose j.araya@sensopart.de; u-boot@lists.denx.de Betreff: RE: [U-Boot] Custom SPL for im.X6UL
-----Original Message----- From: U-Boot [mailto:u-boot-bounces@lists.denx.de] On Behalf Of Araya, Jose Sent: 2019年3月9日 0:59 To: u-boot@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 theFPGA
is not configured, the imx6UL has no access to the DRAM.
The imx6UL has a direct SPI connection to the flash and to theFPGA,
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
SensoPart Industriesensorik GmbH Am Wiedenbach 1 | 79695 Wieden Amtsgericht Freiburg HRB 660163 Gesch?ftsf?hrer: Dr. Theodor Wanner
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