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From: Fabio Estevam <festevam@gmail.com>
To: Giorgio Dal Molin <giorgio.nicole@arcor.de>
Cc: Barebox List <barebox@lists.infradead.org>,
	Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: Re: reset / watchdog on an imx7d soc
Date: Mon, 29 Jun 2020 13:39:31 -0300	[thread overview]
Message-ID: <CAOMZO5Cxa6Yk-uWUummRhNVQbLHvduCZQM9djxXNG683GQ4gRw@mail.gmail.com> (raw)
In-Reply-To: <1036676243.111725.1593448425601@mail.vodafone.de>

Hi Giorgio,

On Mon, Jun 29, 2020 at 1:33 PM Giorgio Dal Molin
<giorgio.nicole@arcor.de> wrote:

> U-Boot configures the ddr3 with c code in its board code 'lowlevel.c'.
> Looking at the code I noticed this special treatment:
>
> static void spl_dram_init(void)
> {
> ...
>         /*
>          * Make sure that both aresetn/core_ddrc_rstn and preset/PHY reset
>          * bits are set after WDOG reset event. DDRC_PRST can only be
>          * released when DDRC clock inputs are stable for at least 30 cycles.
>          */
>         writel(SRC_DDRC_RCR_DDRC_CORE_RST_MASK | SRC_DDRC_RCR_DDRC_PRST_MASK, &src_regs->ddrc_rcr);
>         udelay(500);
> ...
>
> This writel() set both reset bits, the DDRC_CORE (0x2) and the DDRC_PRST (0x1) of the SRC
> register 0x30391000.
> Unfortunately, if I try also to set both bits in my DCD table then barebox doesn't boot anymore;
> I also tried to port the uboot spl_dram_init(void) to my barebox lowlevel.c and I could eventually
> boot barebox with an empty DCD but still adding the second bit (SRC_DDRC_RCR_DDRC_PRST_MASK)
> hangs the soc.

Does it help if you try to apply this U-Boot commit to Barebox?
https://gitlab.denx.de/u-boot/u-boot/-/commit/0e06d63d195670f5181958f43216d7106c05357f

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  reply	other threads:[~2020-06-29 16:39 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-23 13:45 Giorgio Dal Molin
2020-06-23 13:53 ` Fabio Estevam
2020-06-23 15:11   ` Giorgio Dal Molin
2020-06-29  8:44     ` Ahmad Fatoum
2020-06-29 10:53       ` Giorgio Dal Molin
2020-06-29 13:30         ` Ahmad Fatoum
2020-06-29 15:30           ` Giorgio Dal Molin
2020-06-29 15:35             ` Ahmad Fatoum
2020-06-29 16:03               ` Giorgio Dal Molin
2020-06-29 16:11                 ` Ahmad Fatoum
2020-06-29 16:33                   ` Giorgio Dal Molin
2020-06-29 16:39                     ` Fabio Estevam [this message]
2020-07-01  9:52                       ` Giorgio Dal Molin
2020-07-02  9:25                         ` Ahmad Fatoum
2020-07-02 14:51                           ` Giorgio Dal Molin
2020-07-02 15:28                           ` Giorgio Dal Molin
2020-07-02 16:05                             ` Lucas Stach
2020-07-03 14:13                               ` Giorgio Dal Molin
2020-07-02 16:24                             ` Fabio Estevam
2020-07-07  5:52                               ` Giorgio Dal Molin

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