Can't reprogram u-boot on sabre SDP

[jfsimon]

Hi

My goal is to install android on the eMMC on the sabre SDP. Here is what I did:

-Boot the Sabre SDP under NFS

-partition the eMMC with this command:

       # mksdcard-android.sh /dev/mmcblk0

-Used the "dd" command to program u-boot, boot.img, system.img and recovery.img to eMMC

BUT I am unable to overwrite an older u-boot that is already on /dev/mmcblk0 with this command:

# dd if=<new u-boot.bin> of=/dev/mmcblk0 bs=1K skip=1 seek=1; sync

(the reason I need to replace the older u-boot is because it doesn't have the "booti" command.)

I also tried erasing it from u-boot but it doesn't work:

MX6SDL SABRESD U-Boot > mmc dev

Card did not respond to voltage select!

mmc0(part 0) is current device

MMC erase: dev # 0, block # 0, count 256 ... Card did not respond to voltage select!

raise: Signal # 8 caught

raise: Signal # 8 caught

mmc erase failed

0 blocks erase: ERROR

Any ideas?

Thanks a lot

-jf simon

[LeonardoSandova]

the dd command you have used should have erased any previous data you have starting at bs*seek. Also,One way to also 'erase' is to put zeros, meaning:

dd if=/dev/zero of=/dev/mmcblk0 seek=1 count=N

where N is the number of blocks you want to erase. By default blocks are 512 bytes.

Leo

[jfsimon]

Leo,

I agree it should, but it doesn't. No matter what I do 9and i have tried the dd if=/dev/zero...thing) I can't erase the following u-boot:

U-Boot 2009.08 (Jan 29 2013 - 11:33:44)

CPU: Freescale i.MX6 family TO1.1 at 792 MHz

raise: Signal # 8 caught

Temperature:   can't get valid data!

mx6q pll1: 792MHz

mx6q pll2: 528MHz

mx6q pll3: 480MHz

mx6q pll8: 50MHz

ipg clock     : 66000000Hz

ipg per clock : 66000000Hz

uart clock    : 80000000Hz

cspi clock    : 60000000Hz

ahb clock     : 132000000Hz

axi clock   : 198000000Hz

emi_slow clock: 22000000Hz

ddr clock     : 396000000Hz

usdhc1 clock  : 198000000Hz

usdhc2 clock  : 198000000Hz

usdhc3 clock  : 198000000Hz

usdhc4 clock  : 198000000Hz

nfc clock     : 24000000Hz

Board: i.MX6DL/Solo-SABRESD: unknown-board Board: 0x61011 [POR ]

Boot Device: MMC

I2C:   ready

DRAM:   1 GB

MMC:   FSL_USDHC: 0,FSL_USDHC: 1,FSL_USDHC: 2,FSL_USDHC: 3

In:    serial

Out:   serial

Err:   serial

Found PFUZE100! deviceid=10,revid=11

Net:   got MAC address from IIM: 00:04:9f:02:68:10

FEC0 [PRIME]

Hit any key to stop autoboot:  0

MX6SDL SABRESD U-Boot >

Plus when I try to erase the MMC from u-boot it fails as follows:

MX6SDL SABRESD U-Boot > mmc rescan    

Card did not respond to voltage select!

MX6SDL SABRESD U-Boot > mmc bootpart

Card did not respond to voltage select!

Device 1: boot partition 0 is for boot

MX6SDL SABRESD U-Boot > mmc erase 0 100

MMC erase: dev # 1, block # 0, count 256 ... Card did not respond to voltage select!

raise: Signal # 8 caught

raise: Signal # 8 caught

mmc erase failed

0 blocks erase: ERROR

[LeonardoSandova]

You may be booting from the eMMC. in MX6Q, do you have the correct DIP switches to boot from SD? switches 2 and 7 ON and the rest OFF for SD3?

Leo

[jfsimon]

I usually set SW6 to boot from the SD. Then I boot linux over NFS. Then I try to program u-boot to the eMMC with dd. to make sure I am writing to the right device, I remove the SD card.

But even if I boot from eMMC like above, I should be able to use u-boot "mmc" commands to erase the eMMC right?

[chenzhiwei]

Hi jf..

I melt with the same problem... how you resolve these issues?

[YixingKong]

Jf

This discussion is closed since no activity. If you still need help, please feel free to reply with an update to this

discussion, or create another discussion.
Thanks,
Yixing

[YixingKong]

Jf

Had your issue got resolved? If yes, we are going to close the discussion in 3 days. If you still need help please feel

free to contact Freescale.

Thanks,
Yixing