[U-Boot] [PATCH] ARM64: zynqmp: Add support for standard distro boot commands

[Michal Simek <michal.simek@xilinx.com>]

On 1.6.2016 16:23, Alexander Graf wrote:
> 
> 
> On 01.06.16 16:20, Michal Simek wrote:
>> On 1.6.2016 16:12, Alexander Graf wrote:
>>>
>>>
>>> On 01.06.16 15:08, Michal Simek wrote:
>>>> Nand and QSPI are not defined now but this will be extended.
>>>> Based on selected bootmode boot_targets are rewritten.
>>>> Patch also contains detection if variables are saved. If yes don't
>>>> rewrite boot_targets variable.
>>>>
>>>> Also move variable setup to the end of file because SCSI needs to be
>>>> defined before others macros are using it.
>>>>
>>>> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
>>>> ---
>>>>
>>>> Patch depends on
>>>> "env: Setup GD_FLG_ENV_DEFAULT flag when default environment are used"
>>>>
>>>> ---
>>>>  board/xilinx/zynqmp/zynqmp.c    | 20 +++++++++-----
>>>>  include/configs/xilinx_zynqmp.h | 59 ++++++++++++++++++++++++++++++-----------
>>>>  2 files changed, 57 insertions(+), 22 deletions(-)
>>>>
>>>> diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
>>>> index 4623cd49e9c7..46c332215b6b 100644
>>>> --- a/board/xilinx/zynqmp/zynqmp.c
>>>> +++ b/board/xilinx/zynqmp/zynqmp.c
>>>> @@ -215,6 +215,11 @@ int board_late_init(void)
>>>>  	u32 reg = 0;
>>>>  	u8 bootmode;
>>>>  
>>>> +	if (!(gd->flags & GD_FLG_ENV_DEFAULT)) {
>>>> +		debug("Saved variables - Skipping\n");
>>>> +		return 0;
>>>> +	}
>>>> +
>>>>  	reg = readl(&crlapb_base->boot_mode);
>>>>  	bootmode = reg & BOOT_MODES_MASK;
>>>>  
>>>> @@ -222,31 +227,32 @@ int board_late_init(void)
>>>>  	switch (bootmode) {
>>>>  	case JTAG_MODE:
>>>>  		puts("JTAG_MODE\n");
>>>> -		setenv("modeboot", "jtagboot");
>>>> +		setenv("boot_targets", "pxe dhcp");
>>>
>>> Is there a particular reason you're overwriting the boot_targets rather
>>> than prepending them?
>>>
>>> If I plug in an SD card with U-Boot on it, but my OS is on a SATA
>>> attached disk (which is how I currently use the ZynqMP), this would set
>>> the boot_targets to SD rather than "SD first, default list later".
>>>
>>> If we instead do something like
>>>
>>>   boot_targets = "pxe dhcp " + getenv(boot_targets);
>>>
>>> we would maintain a workable fallback path. Yes, we might check a target
>>> device twice, but since we know that it fails I don't think it's too
>>> much of a problem.
>>
>> No problem to do it but maybe in mmc0 case we should also remove mmc0
>> from boot_targets which is already there.
> 
> If you want to write the code for that, sure :).

Let's just use simple version first and then we can tune this.
There is checking if boot fails that's why it is not big deal just
showing down boot process.

Thanks,
Michal