[U-Boot] [PATCH 5/5] ls2080ardb: Convert to distro boot

[York Sun]

On 05/13/2016 12:36 PM, Alexander Graf wrote:
> 
> 
> On 13.05.16 19:05, York Sun wrote:
>> On 05/13/2016 10:03 AM, Alexander Graf wrote:
>>>
>>>
>>>> Am 13.05.2016 um 18:21 schrieb York Sun <york.sun at nxp.com>:
>>>>
>>>>> On 05/13/2016 07:32 AM, Alexander Graf wrote:
>>>>>
>>>>>> Am 13.05.2016 um 16:26 schrieb Stuart Yoder <stuart.yoder at nxp.com>:
>>>>>>
>>>>>>
>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Alexander Graf [mailto:agraf at suse.de]
>>>>>>> Sent: Friday, May 13, 2016 7:22 AM
>>>>>>> To: u-boot at lists.denx.de
>>>>>>> Cc: Stuart Yoder <stuart.yoder at nxp.com>; york sun <york.sun at nxp.com>
>>>>>>> Subject: [PATCH 5/5] ls2080ardb: Convert to distro boot
>>>>>>>
>>>>>>> Most new systems in U-Boot these days make use of the generic "distro"
>>>>>>> framework which allows a user to have U-Boot scan for a bootable OS
>>>>>>> on all available media types.
>>>>>>>
>>>>>>> This patch converts the LS2080ARDB board to use that framework instead
>>>>>>> of booting from a hard coded flash offset.
>>>>>>>
>>>>>>> Signed-off-by: Alexander Graf <agraf at suse.de>
>>>>>>>
>>>>>>> ---
>>>>>>>
>>>>>>> This obviously means that we can no longer boot from said offset. Is
>>>>>>> that a reasonable thing to do or should I put the bootm back into the
>>>>>>> default boot command and only do distro boot if it fails?
>>>>>>
>>>>>> To date all armv8 FSL/NXP sdk releases, field engineers, etc have been using
>>>>>> bootm.  I'm a little concerned about changing the default boot command
>>>>>> right now...as I assume things will unexpectedly appear to just stop
>>>>>> working.  Or, is booting from the NOR flash one of the distro boot
>>>>>> "media" types?
>>>>>
>>>>> The problem with boot from NOR is that we have no source of information on what lies where. So distro boot can't have it in its target list, as you have to know magical offsets.
>>>>>
>>>>> We could put the magical bootm after tge distro list, but that would mean that field engineers get pxe boot with long timeouts first and then their NOR bootm booted.
>>>>>
>>>>> So the only option left that I can see is to always try magical offset NOR bootm and do distro boot if it fails. Then just tell people to write zeros to the NOR kernel offset and they get distro boot automatically.
>>>>
>>>> Alex,
>>>>
>>>> I suggest to attempt current boot method before moving on to other sources. I
>>>> presume booting from NOR would check the image header first. If the image is
>>>> valid, go ahead to boot it. Otherwise, move on.
>>>
>>> Ok, will do.
>>>
>>>>
>>>> Beside, it would be helpful to define a list and order of boot source.
>>>
>>> That's what the patch does, no? See the BOOT_TARGET_DEVICES define. It's probably incomplete, but describes the boot order and boot sources.
>>>
>>
>> Yes I saw it. Would it be possible to use environmental variable for this
>> purpose, so users can specify the list and order? If it is too complicated, we
>> can live with the macro and recompile as needed.
> 
> With the patches applied as is, the environment looks like this:
> 
> => printenv
> arch=arm
> baudrate=115200
> board=ls2080ardb
> board_name=ls2080ardb
> boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr}
> ${prefix}${script}; source ${scriptaddr}
> boot_efi_binary=load ${devtype} ${devnum}:${distro_bootpart}
> ${kernel_addr_r} efi/boot/bootaa64.efi; if fdt addr ${fdt_addr_r}; then
> bootefi ${kernel_addr_r} ${fdt_addr_r};elsebootefi ${kernel_addr_r}
> ${fdtcontroladdr};fi
> boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any
> ${scriptaddr} ${prefix}extlinux/extlinux.conf
> boot_net_usb_start=usb start
> boot_prefixes=/ /boot/
> boot_script_dhcp=boot.scr.uimg
> boot_scripts=boot.scr.uimg boot.scr
> boot_targets=mmc0 scsi0 dhcp
> bootargs=console=ttyS1,115200 root=/dev/ram0
> earlycon=uart8250,mmio,0x21c0600 ramdisk_size=0x2000000
> default_hugepagesz=2m hugepagesz=2m hugepages=256
> bootcmd=run mcinitcmd && fsl_mc lazyapply dpl 0x580700000 && setenv
> ethact DPMAC5 at xgmii && run distro_bootcmd
> bootcmd_dhcp=run boot_net_usb_start; if dhcp ${scriptaddr}
> ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile
> ${fdtfile}; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch
> ${bootp_arch};setenv bootp_vci PXEClient:Arch:00011:UNDI:003000;setenv
> bootp_arch 0xb;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r}
> dtb/${efi_fdtfile};if fdt addr ${fdt_addr_r}; then bootefi
> ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r}
> ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv
> bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv
> efi_old_vci;
> bootcmd_mmc0=setenv devnum 0; run mmc_boot
> bootcmd_scsi0=setenv devnum 0; run scsi_boot
> bootdelay=2
> cpu=armv8
> distro_bootcmd=setenv scsi_need_init; for target in ${boot_targets}; do
> run bootcmd_${target}; done
> efi_dtb_prefixes=/ /dtb/ /dtb/current/
> ethact=DPMAC1 at xgmii
> ethprime=DPNI1
> fdt_addr_r=0x88000000
> fdt_high=0xa0000000
> fdtcontroladdr=ffcfd498
> fdtfile=fsl-ls2080a-rdb.dtb
> hwconfig=fsl_ddr:bank_intlv=auto
> initrd_high=0xffffffffffffffff
> kernel_addr=0x100000
> kernel_addr_r=0x81000000
> kernel_load=0xa0000000
> kernel_size=0x2800000
> kernel_start=0x581100000
> load_efi_dtb=load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r}
> ${prefix}${efi_fdtfile}
> loadaddr=0x80100000
> mcinitcmd=fsl_mc start mc 0x580300000 0x580800000
> mmc_boot=if mmc dev ${devnum}; then setenv devtype mmc; run
> scan_dev_for_boot_part; fi
> pxefile_addr_r=0x81000000
> ramdisk_addr=0x800000
> ramdisk_addr_r=0x89000000
> ramdisk_size=0x2000000
> scan_dev_for_boot=echo Scanning ${devtype}
> ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run
> scan_dev_for_extlinux; run scan_dev_for_scripts; done;run scan_dev_for_efi;
> scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable
> devplist; env exists devplist || setenv devplist 1; for distro_bootpart
> in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart}
> bootfstype; then run scan_dev_for_boot; fi; done
> scan_dev_for_efi=setenv efi_fdtfile ${fdtfile}; for prefix in
> ${efi_dtb_prefixes}; do if test -e ${devtype}
> ${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run
> load_efi_dtb; fi;done;if test -e ${devtype} ${devnum}:${distro_bootpart}
> efi/boot/bootaa64.efi; then echo Found EFI removable media binary
> efi/boot/bootaa64.efi; run boot_efi_binary; echo EFI LOAD FAILED:
> continuing...; fi; setenv efi_fdtfile
> scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart}
> ${prefix}extlinux/extlinux.conf; then echo Found
> ${prefix}extlinux/extlinux.conf; run boot_extlinux; echo SCRIPT FAILED:
> continuing...; fi
> scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e
> ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo
> Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT
> FAILED: continuing...; fi; done
> scriptaddr=0x80800000
> scsi_boot=run scsi_init; if scsi dev ${devnum}; then setenv devtype
> scsi; run scan_dev_for_boot_part; fi
> scsi_init=if ${scsi_need_init}; then setenv scsi_need_init false; scsi
> scan; fi
> scsidevs=0
> soc=fsl-layerscape
> stderr=serial
> stdin=serial
> stdout=serial
> usb_boot=usb start; if usb dev ${devnum}; then setenv devtype usb; run
> scan_dev_for_boot_part; fi
> vendor=freescale
> 
> #################
> 
> In there you can see a variable called "boot_targets" which contains the
> values "mmc0 scsi0 dhcp".
> 

Ah, thanks. I didn't realize the macro ends up in the boot_targets.

York