[U-Boot] Support for i.MX7ULP rev B0

Fri Jul 19 01:48:11 UTC 2019

Hi Fabio,

> -----Original Message-----
> From: Fabio Estevam [mailto:festevam at gmail.com]
> Sent: 2019年7月18日 20:17
> To: Peng Fan <peng.fan at nxp.com>
> Cc: Ye Li <ye.li at nxp.com>; Stefano Babic <sbabic at denx.de>; U-Boot-Denx
> <u-boot at lists.denx.de>
> Subject: Re: Support for i.MX7ULP rev B0
> 
> Hi Peng and Ye Li,
> 
> On Wed, Jul 17, 2019 at 10:20 PM Peng Fan <peng.fan at nxp.com> wrote:
> >
> > Hi Fabio,
> >
> > I already submitted patches 2 months ago, but still not merged.
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatc
> >
> hwork.ozlabs.org%2Fcover%2F1099916%2F&data=02%7C01%7Cpeng.fa
> n%40nx
> >
> p.com%7Ca81d1ac73bb74951499008d70b79dc16%7C686ea1d3bc2b4c6fa92
> cd99c5c3
> >
> 01635%7C0%7C0%7C636990490326107629&sdata=0KGKKi2EuOI0ntK8
> utTsUZk1d
> > W4SbbYvDY8TDYMPC1g%3D&reserved=0
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatc
> >
> hwork.ozlabs.org%2Fpatch%2F1100269%2F&data=02%7C01%7Cpeng.fa
> n%40nx
> >
> p.com%7Ca81d1ac73bb74951499008d70b79dc16%7C686ea1d3bc2b4c6fa92
> cd99c5c3
> >
> 01635%7C0%7C0%7C636990490326107629&sdata=ILHCC6FZxCpSzPHa
> 4xM2s6z6a
> > MAUsjrspbnuX4xCP7U%3D&reserved=0
> 
> I applied all these 20 patches and now I can boot the kernel (from NXP
> 4.14.98 tree). Thanks!

https://patchwork.ozlabs.org/patch/1100265/
This patch needs a small change to apply, because FSL_ESDHC has changed
to FSL_ESDHC_IMX.
Stefano, do you expect to resend the series? Or you could help the small change?

> 
> I do see some error messages in U-Boot related to reserving fdt memory:
> 
> U-Boot 2019.07-00348-g85b2b1ec2d-dirty (Jul 18 2019 - 09:03:24 -0300)
> 
> CPU:   Freescale i.MX7ULP rev2.0 at 500 MHz
> Reset cause: POR
> Boot mode: Dual boot
> Model: NXP i.MX7ULP EVK
> DRAM:  1 GiB
> MMC:   FSL_SDHC: 0
> Loading Environment from MMC... OK
> In:    serial at 402D0000
> Out:   serial at 402D0000
> Err:   serial at 402D0000
> Net:   Net Initialization Skipped
> No ethernet found.
> Hit any key to stop autoboot:  0
> switch to partitions #0, OK
> mmc0 is current device
> ERROR: reserving fdt memory region failed (addr=9ff00000 size=100000)
> 7416256 bytes read in 383 ms (18.5 MiB/s) Booting from mmc ...
> ERROR: reserving fdt memory region failed (addr=9ff00000 size=100000)
> 21429 bytes read in 25 ms (836.9 KiB/s)
> Kernel image @ 0x60800000 [ 0x000000 - 0x7129c0 ] ## Flattened Device
> Tree blob at 63000000
>    Booting using the fdt blob at 0x63000000
> ERROR: reserving fdt memory region failed (addr=9ff00000 size=100000)
>    Using Device Tree in place at 63000000, end 630083b4
> 
> Starting kernel ...
> 
> 
> Then kernel starts and the following clock warnings are shown:

There is a downstream patch to gate off APll_PFD1/2/3, with that patch applied
you will not see kernel warning.

i.MX7ULP: change USDHC clock rate

    Change USDHC0 and USDHC1 per clock source from APLL_PFD1,
    and set the APll_PFD1 clock rate to 352.8MHz.

    Also gate off APll_PFD1/2/3 before boot OS, otherwise set
    the clock rate of APll_PFD1/2/3 during OS boot up will triger
    some warning message.

Regards,
Peng.

> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 0 at drivers/clk/imx/clk-pfdv2.c:147
> clk_pfd_set_rate+0xc0/0xd8
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted
> 4.14.98-05986-gbd02ff8b9368-dirty #26 Hardware name: Freescale
> i.MX7ULP (Device Tree) [<8010ed04>] (unwind_backtrace) from [<8010b25c>]
> (show_stack+0x10/0x14) [<8010b25c>] (show_stack) from [<809d68c4>]
> (dump_stack+0x78/0x8c) [<809d68c4>] (dump_stack) from [<8012db64>]
> (__warn+0xe8/0x100) [<8012db64>] (__warn) from [<8012dc2c>]
> (warn_slowpath_null+0x20/0x28) [<8012dc2c>] (warn_slowpath_null) from
> [<8046795c>] (clk_pfd_set_rate+0xc0/0xd8) [<8046795c>] (clk_pfd_set_rate)
> from [<804608b8>] (clk_change_rate+0x184/0x274) [<804608b8>]
> (clk_change_rate) from [<80460c50>]
> (clk_core_set_rate_nolock+0x68/0xb0)
> [<80460c50>] (clk_core_set_rate_nolock) from [<80460cb8>]
> (clk_set_rate+0x20/0x30)
> [<80460cb8>] (clk_set_rate) from [<80e3c1e0>]
> (imx7ulp_clocks_init+0x10fc/0x11a8)
> [<80e3c1e0>] (imx7ulp_clocks_init) from [<80e1d184>]
> (of_clk_init+0x164/0x1e4) [<80e1d184>] (of_clk_init) from [<80e044d0>]
> (time_init+0x24/0x2c) [<80e044d0>] (time_init) from [<80e00b30>]
> (start_kernel+0x25c/0x394) [<80e00b30>] (start_kernel) from [<6000807c>]
> (0x6000807c)
> random: get_random_bytes called from print_oops_end_marker+0x44/0x58
> with crng_init=0 ---[ end trace f4b5c563367915ee ]--- ------------[ cut
> here ]------------
> WARNING: CPU: 0 PID: 0 at drivers/clk/imx/clk-pfdv2.c:147
> clk_pfd_set_rate+0xc0/0xd8
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W
> 4.14.98-05986-gbd02ff8b9368-dirty #26
> Hardware name: Freescale i.MX7ULP (Device Tree) [<8010ed04>]
> (unwind_backtrace) from [<8010b25c>] (show_stack+0x10/0x14)
> [<8010b25c>] (show_stack) from [<809d68c4>] (dump_stack+0x78/0x8c)
> [<809d68c4>] (dump_stack) from [<8012db64>] (__warn+0xe8/0x100)
> [<8012db64>] (__warn) from [<8012dc2c>] (warn_slowpath_null+0x20/0x28)
> [<8012dc2c>] (warn_slowpath_null) from [<8046795c>]
> (clk_pfd_set_rate+0xc0/0xd8) [<8046795c>] (clk_pfd_set_rate) from
> [<804608b8>] (clk_change_rate+0x184/0x274) [<804608b8>]
> (clk_change_rate) from [<80460c50>]
> (clk_core_set_rate_nolock+0x68/0xb0)
> [<80460c50>] (clk_core_set_rate_nolock) from [<80460cb8>]
> (clk_set_rate+0x20/0x30)
> [<80460cb8>] (clk_set_rate) from [<80e3c220>]
> (imx7ulp_clocks_init+0x113c/0x11a8)
> [<80e3c220>] (imx7ulp_clocks_init) from [<80e1d184>]
> (of_clk_init+0x164/0x1e4) [<80e1d184>] (of_clk_init) from [<80e044d0>]
> (time_init+0x24/0x2c) [<80e044d0>] (time_init) from [<80e00b30>]
> (start_kernel+0x25c/0x394) [<80e00b30>] (start_kernel) from [<6000807c>]
> (0x6000807c) ---[ end trace f4b5c563367915ef ]---
> 
> I do not see the U-Boot error. nor the kernel clock warnings if I use the NXP
> 2019.04 U-Boot.
> 
> Any ideas on how to solve these problems?
> 
> Thanks