TDA2SX: How does kernel get mac address from the uboot

Hi Liu Gan,

TDA2x have two MAC addresses programmed in the device. They are contained in the 4x CTRL_CORE_MAC_ID_SW_x registers (each register contains 3 octets, and it takes 2 registers for the all 6 octets of a MAC address). You can see this thread for some details:

I am not sure about current implementation, but can you check the board_eth_init() function in u-boot/board/ti/dra7xx/evm.c and see if the MAC addresses you get are not set there.

Regards,

Yordan

Hi Yordan,

Thanks for your reply. I can get the registers value from uboot prompt as:

=> md 0x4A002514
4a002514: 00dbc87a 00a8e2c1 00dbc87b 00a8e2c1

So the two mac address store in the chip should be 'a8:e2:c1:db:c8:7a' and 'a8:e2:c1:db:c8:7b' respectively.

Also i learned about the board_eth_init() function. But i found that it won't be called in my startup process. So the 'ethaddr' and 'eth1addr' env variables won't be set by it.But i can found that the value of 'ethaddr' was set to 'a8:e2:c1:db:c8:7b' by printenv. I don't know where this is be done.

=> printenv ethaddr
ethaddr=a8:e2:c1:db:c8:7b
=> printenv eth1addr
## Error: "eth1addr" not defined

If i set the 'ethaddr' to 'a8:e2:c1:db:c8:7a' and the 'eth1addr' to 'a8:e2:c1:db:c8:7b' respectively. I will get the two values are assigned to eth0 and eth1 interfaces in the kernel.Though i don't know how this was achieved. Could you please help me on this? And i will work on the uboot envs by myself.

Regards,
Liu Gan 

Hi

Can you dump the full list of environment variables 

=>printenv

Hi Srirama,

Only slave 1 is used in the uboot, so the mac address of slave1, whis is 'a8:e2:c1:db:c8:7b' was set as ethaddr env variable. And eth1addr var was left unset in the uboot.

But i am confused why would i get the 'a8:e2:c1:db:c8:7b' address by calling function 'of_get_mac_address' from cpsw_slave_init while the slave id is 0. 

FYI:

=> printenv
=fdf1d778
arch=arm
args_fit=setenv bootargs console=${console}
args_mmc=run finduuid;setenv bootargs console=${console} ${optargs} root=PARTUUID=${uuid} rw rootfstype=${mmcrootfstype}
baudrate=115200
board=tda2xx_atp
board_findfdt=if test $board_name = hirain-tda2xx-atp; then setenv fdtfile hirain-tda2x-atp.dtb; fi;
board_name=hirain-tda2xx-atp
board_rev=A.0
boot_fdt=try
boot_fit=0
boot_os=0
boot_part=9
bootargs=androidboot.serialno=0800f01243140802
bootcmd=if test ${dofastboot} -eq 1; then echo Boot fastboot requested, resetting dofastboot ...;setenv dofastboot 0; saveenv;echo Booting into fastboot ...; fastboot 0; fi;if test ${boot_fit} -eq 1; then run update_to_fit;fi;run findfdt; run envboot; run mmcboot;run emmc_android_boot;
bootdelay=2
bootdir=/boot
bootenvfile=uEnv.txt
bootfile=zImage
bootm_size=0x10000000
bootpart=1:2
bootscript=echo Running bootscript from mmc${mmcdev} ...; source ${loadaddr}
console=ttyO2,115200n8
cpu=armv7
dfu_alt_info_emmc=rawemmc raw 0 3751936;boot part 1 1;rootfs part 1 2;MLO fat 1 1;MLO.raw raw 0x100 0x100;u-boot.img.raw raw 0x300 0x1000;u-env.raw raw 0x1300 0x200;spl-os-args.raw raw 0x1500 0x200;spl-os-image.raw raw 0x1700 0x6900;spl-os-args fat 1 1;spl-os-image fat 1 1;u-boot.img fat 1 1;uEnv.txt fat 1 1
dfu_alt_info_mmc=boot part 0 1;rootfs part 0 2;MLO fat 0 1;MLO.raw raw 0x100 0x100;u-boot.img.raw raw 0x300 0x1000;u-env.raw raw 0x1300 0x200;spl-os-args.raw raw 0x1500 0x200;spl-os-image.raw raw 0x1700 0x6900;spl-os-args fat 0 1;spl-os-image fat 0 1;u-boot.img fat 0 1;uEnv.txt fat 0 1
dfu_alt_info_qspi=MLO raw 0x0 0x040000;u-boot.img raw 0x040000 0x0100000;u-boot-spl-os raw 0x140000 0x080000;u-boot-env raw 0x1C0000 0x010000;u-boot-env.backup raw 0x1D0000 0x010000;kernel raw 0x1E0000 0x800000;rootfs raw 0x9e0000 0x1620000
dfu_alt_info_ram=kernel ram 0x80200000 0x4000000;fdt ram 0x80f80000 0x80000;ramdisk ram 0x81000000 0x4000000
dfu_bufsiz=0x10000
dofastboot=0
emmc_android_boot=setenv eval_bootargs setenv bootargs $bootargs; run eval_bootargs; setenv mmcdev 1; setenv fdt_part 3; setenv boot_part 9; if test $reboot_image = recovery; then setenv boot_part 8; setenv reboot_image boot; saveenv; fi;setenv machid fe6; mmc dev $mmcdev; mmc rescan; part start mmc ${mmcdev} ${fdt_part} fdt_start; part size mmc ${mmcdev} ${fdt_part} fdt_size; part start mmc ${mmcdev} ${boot_part} boot_start; part size mmc ${mmcdev} ${boot_part} boot_size; mmc read ${fdtaddr} ${fdt_start} ${fdt_size}; mmc read ${loadaddr} ${boot_start} ${boot_size}; echo Booting from eMMC ...; bootm $loadaddr $loadaddr $fdtaddr;
envboot=mmc dev ${mmcdev}; if mmc rescan; then echo SD/MMC found on device ${mmcdev};if run loadbootscript; then run bootscript;else if run loadbootenv; then echo Loaded env from ${bootenvfile};run importbootenv;fi;if test -n $uenvcmd; then echo Running uenvcmd ...;run uenvcmd;fi;fi;fi;
ethaddr=a8:e2:c1:db:c8:7b
eval_bootargs=setenv bootargs androidboot.serialno=${serial#}
fdt_addr_r=0x88000000
fdt_part=3
fdtaddr=0x88000000
fdtfile=hirain-tda2x-atp.dtb
findfdt=if test $board_name = omap5_uevm; then setenv fdtfile omap5-uevm.dtb; fi; if test $board_name = dra7xx; then setenv fdtfile dra7-evm.dtb; fi;if test $board_name = dra72x-revc; then setenv fdtfile dra72-evm-revc.dtb; fi;if test $board_name = dra72x; then setenv fdtfile dra72-evm.dtb; fi;if test $board_name = dra71x; then setenv fdtfile dra71-evm.dtb; fi;if test $board_name = dra76x; then setenv fdtfile dra76-evm.dtb; fi;if test $board_name = beagle_x15; then setenv fdtfile am57xx-beagle-x15.dtb; fi;if test $board_name = beagle_x15_revb1; then setenv fdtfile am57xx-beagle-x15-revb1.dtb; fi;if test $board_name = am57xx_evm; then setenv fdtfile am57xx-evm.dtb; fi;if test $board_name = am57xx_evm_reva3; then setenv fdtfile am57xx-evm-reva3.dtb; fi;if test $board_name = am572x_idk && test $idk_lcd = no; then setenv fdtfile am572x-idk.dtb; fi;if test $board_name = am572x_idk && test $idk_lcd = osd101t2045; then setenv fdtfile am572x-idk-lcd-osd.dtb; fi;if test $board_name = am572x_idk && test $idk_lcd = osd101t2587; then setenv fdtfile am572x-idk-lcd-osd101t2587.dtb; fi;if test $board_name = am571x_idk && test $idk_lcd = no; then setenv fdtfile am571x-idk.dtb; fi;if test $board_name = am571x_idk && test $idk_lcd = osd101t2045; then setenv fdtfile am571x-idk-lcd-osd.dtb; fi;if test $board_name = am571x_idk && test $idk_lcd = osd101t2587; then setenv fdtfile am571x-idk-lcd-osd101t2587.dtb; fi;if test $board_findfdt != undefined; then run board_findfdt; fi;if test $fdtfile = undefined; then echo WARNING: Could not determine device tree to use; fi;
finduuid=part uuid mmc ${bootpart} uuid
fit_bootfile=fitImage.itb
fit_loadaddr=0x88000000
importbootenv=echo Importing environment from mmc${mmcdev} ...; env import -t ${loadaddr} ${filesize}
kernel_addr_r=0x82000000
loadaddr=0x82000000
loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenvfile}
loadbootscript=fatload mmc ${mmcdev} ${loadaddr} boot.scr
loadfdt=load ${devtype} ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}
loadfit=run args_fit; bootm ${loadaddr}#${fdtfile};
loadimage=load mmc ${bootpart} ${loadaddr} ${bootdir}/${bootfile}
machid=fe6
mmcboot=if mmc dev ${mmcdev}; then setenv devtype mmc; if mmc rescan; then echo SD/MMC found on device ${mmcdev};if run loadimage; then run loadfdt; echo Booting from mmc${mmcdev} ...; run args_mmc; bootz ${loadaddr} - ${fdtaddr}; fi; fi; fi;
mmcdev=1
mmcloados=run args_mmc; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdtaddr}; else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi;
mmcrootfstype=ext4 rootwait
netargs=setenv bootargs console=${console} ${optargs} root=/dev/nfs nfsroot=${serverip}:${rootpath},${nfsopts} rw ip=dhcp
netboot=echo Booting from network ...; setenv autoload no; dhcp; run netloadimage; run netloadfdt; run netargs; bootz ${loadaddr} - ${fdtaddr}
netloadfdt=tftp ${fdtaddr} ${fdtfile}
netloadimage=tftp ${loadaddr} ${bootfile}
nfsopts=nolock
partitions=uuid_disk=${uuid_gpt_disk};name=rootfs,start=2MiB,size=-,uuid=${uuid_gpt_rootfs}
partitions_android=uuid_disk=${uuid_gpt_disk};name=xloader,start=128K,size=256K,uuid=${uuid_gpt_xloader};name=bootloader,size=2304K,uuid=${uuid_gpt_bootloader};name=environment,size=256K,uuid=${uuid_gpt_environment};name=misc,size=128K,uuid=${uuid_gpt_misc};name=reserved,size=384K,uuid=${uuid_gpt_reserved};name=efs,size=16M,uuid=${uuid_gpt_efs};name=crypto,size=16K,uuid=${uuid_gpt_crypto};name=recovery,size=30M,uuid=${uuid_gpt_recovery};name=boot,size=10M,uuid=${uuid_gpt_boot};name=system,size=768M,uuid=${uuid_gpt_system};name=vendor,size=256M,uuid=${uuid_gpt_vendor};name=cache,size=256M,uuid=${uuid_gpt_cache};name=ipu1,size=8M,uuid=${uuid_gpt_ipu1};name=ipu2,size=8M,uuid=${uuid_gpt_ipu2};name=dsp1,size=8M,uuid=${uuid_gpt_dsp1};name=dsp2,size=8M,uuid=${uuid_gpt_dsp2};name=userdata,size=-,uuid=${uuid_gpt_userdata}
pxefile_addr_r=0x80100000
ramdisk_addr_r=0x88080000
rdaddr=0x88080000
reboot_image=boot
rootpath=/export/rootfs
scriptaddr=0x80000000
scsidevs=0
serial#=0800f01243140802
soc=omap5
static_ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off
stderr=serial@48020000
stdin=serial@48020000
stdout=serial@48020000
update_to_fit=setenv loadaddr ${fit_loadaddr}; setenv bootfile ${fit_bootfile}
usbtty=cdc_acm
vendor=hirain
ver=U-Boot 2016.05-svn1450 (Nov 30 2019 - 17:14:02 +0800)
vram=16M

Environment size: 7604/65531 bytes

Hi Sriram,

As i shown in the origin post, i enable the 'dual-emac' property under the 'ethernet@48484000' dts node. I want the two mac ports worked standalone.

The MAC address is actually read in uboot and uboot dynamically updates the device tree blob before passing it to the kernel.
Could you please tell me how does this achieved in code? I tried to trace the kernel code for this these two days, but i am failed.

As for my original question. I know that why i got two same addresses now.
The eth1 port is used in uboot, so the uboot read its mac address from the efuse and set the value as 'ethaddr' variable. And then the 'ethaddr' was used to dynimically updates the slave0 node in the device tree blob.That's why i get the 'a8:e2:c1:db:c8:7b' address by ifconfig.
As for the eth1 interface, both the 'mac-address' property in the slave1 node and 'eth1addr' env variable from uboot are invalid, so the kernel try to get the mac-address from the efuse by calling 'ti_cm_get_macid' in function 'cpsw_probe_dt'.

Regards,
Liu Gan

Hi Srirama,

I will dive into this myself, thanks for your help!

Regards,
Liu Gan