Hi Hans, Apologies for the top posting but everytime I press a key in this Google editor I lose one line of the display.
Thanks for the reply. I've tried to generate U-Boot with CONS_INDEX = 1 and 3 and 5. These are the only allowable values. However, I get the same gibberish to matter what value I specify. What might be relevant is that the serial output is valid when the tablet boots from NAND. There is one warning line " WRN:L486(drivers/usb/sunxi_usb/hcd/hcd0/sunxi_hcd0.c):get no_suspend status failed" after "Starting kernel". If I insert the SD card after this I get a gibberish stream starting with "UUUUUUUUUUU" and containing "$226&&". The stream also contains many 0xEFBFBD. Any suggestions will be appreciated. Thanks, Steven On Monday, 11 July 2016 19:10:48 UTC+10, Hans de Goede wrote: > > Hi, > > On 10-07-16 23:13, Steven Saunderson wrote: > > Hi, > > > > I have an A33 powered tablet (10" PendoPad) and I'm trying to get it to > boot from SD card. I'd like to change this Android box into a Linux box. > > > > I'm using the latest U-Boot with settings from the A33 configs that are > supplied. I have a monitor connected to the UART0 pins on the board and > can see the boot0/boot1 output when the tablet boots from NAND. But when I > try to boot from SD card all I see are strings of jibberish (e.g. "2666&& > "). I've tried monitoring at different baud rates. > > > > I realise that U-Boot won't get very far because probably many other > settings are wrong for the hardware. But I thought I would be able to at > least get some sensible output on UART0. > > > > I'm writing u-boot-sunxi-with-spl to offset 8kB in the SD card. Is this > correct for the A33 ? > > Yes that is correct. > > > Does anybody have any suggestions I can try ? > > How did you create your u-boot defconfig? It sounds like you're not using > the right uart > pins, for most A33 tablets you need: > > CONFIG_SYS_EXTRA_OPTIONS="CONS_INDEX=5" > > In you're u-boot defconfig, if you already have that then try dropping it > :) > > I would advice you to start with a pre-existing defconfig, e.g the > ga10h_v1_1_defconfig, which is for a 10" tablet, which with some luck > maybe a lot like yours (all tablets seem to copy from the same reference > design, and other then the wifi / accelerometer / touchscreen and > chosen lcd panel seem to all be identical. > > Regards, > > Hans > > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
