Hi,
I've encountered occasional glitches while writing to the sd card
via u-boot(2018.07) on a Pi 3 B+. The goal is to write the bootcount
in the boot partition. As a test, this is the loop I used to read, display
contents, write to the same file over and over again.
```
mw 200000 0
while itest *200000 == 0 ; do
fatload mmc 0:1 $kernel_addr_r resin-image
md $kernel_addr_r 18
fatwrite mmc 0:1 $kernel_addr_r resin-image 18
echo === done ====
done
```
resin-image is a file in the boot partition that has some text in it.
After a few minutes of this loop running, I 'sometimes' get this error
and the sd card stops working
```
writing resin-image
wait_transfer_complete - still waiting after 100001 retries
mmc write failed
Error: flush fat buffer
** Unable to write "resin-image" from mmc 0:1 **
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:376/bcm2835_prepare_data()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
** Can't read partition table on 0:0 **
** Invalid partition 1 **
00080000: 4e204f44 5220544f 564f4d45 48542045 DO NOT REMOVE TH
00080010: 46205349 0a454c49 0f030f03 0f030f03 IS FILE.........
00080020: 0f030f03 0f030f03 01600103 03030300 ..........`.....
00080030: 03030303 03030303 03030303 03030303 ................
00080040: 03030303 03030303 03030303 03034103 .............A..
00080050: 03030303 03030303 03030303 03030303 ................
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
** Can't read partition table on 0:0 **
** Invalid partition 1 **
```
What is even more concerning is that the device can't boot. Even if a
write failed.
Subsequent reads seem to fail as well.
```
U-Boot> mmc part
Partition Map for MMC device 0 -- Partition Type: DOS
Part Start Sector Num Sectors UUID Type
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
WARNING at
/home/zubairlk/resin/yocto/resin-raspberrypi3/build/tmp/work/raspberrypi3-poky-linux-gnueabi/u-boot/1_2018.07-r0/git/drivers/mmc/bcm2835_sdhost.c:408/bcm2835_send_command()!
** Can't read partition table on 0:0 **
U-Boot>
```
I can recover the device after a reboot.
Any thoughts/ideas about where/what I should look for?
Or if I'm lucky, any wip patches floating around?
Thanks
Regards,
ZubairLK
p.s. The sd card is a good SanDisk one..
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