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

[Fabio Estevam]

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://patchwork.ozlabs.org/cover/1099916/
> https://patchwork.ozlabs.org/patch/1100269/

I applied all these 20 patches and now I can boot the kernel (from NXP
4.14.98 tree). Thanks!

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:

------------[ 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