Hi,
Le 09/01/2017 à 08:20, Kever Yang a écrit :
On 01/06/2017 06:52 PM, Romain Perier wrote:
Add Rockchip Engineers to Cc:
Le 06/01/2017 à 11:28, Romain Perier a écrit :
Hello,
I have a strange behaviour with the SPL on rk3288.
When I build u-boot-rockchip master for the rock2 (rock2_defconfig),
I can easily start u-boot SPL and u-boot from an sdcard (the emmc
boot partition is erased so my board starts in maskrom mode by
default) without any issues.
Now, I load uboot SPL and uboot over usb:
- I power up the board
- I generate an image for the bootrom:
# tools/mkimage -n rk3288 -T rkimage -d spl/u-boot-spl-dtb.bin out
- I uploaded this image via usb to the board
# cat out | openssl rc4 -K 7c4e0304550509072d2c7b38170d1711 |
../tools/rkflashtool/rkflashtool l
I get no output from the SPL. I have investigated and found that it
is caused by sdram_rk3288.c: sdram_init(). More especially by the
function phy_pctrl_reset(). I enabled EARLY_UART and added 2
printascii() in this function. This functions hangs in the second
for loop. I hacked this function locally, I reduce the number of
iterations from 4 to 3 then I added 2 uart outputs to this function
and "OH!": it works, I get the following output:
pctrl_reset:for
pctrl_reset:end for
pctrl_reset:for
pctrl_reset:end for
U-Boot SPL 2016.11-08675-ga4ae4ddda3-dirty (Jan 06 2017 - 10:35:41)
Now, if I remove my printascii() functions completly, it's no longer
working. Which suggests that it might have something to do with busy
wait delays... (I could be wrong)
From the sdram setup point of view, I don't see a real difference
between an SPL loaded from sdcard and an SPL loaded via usb.
Rockchip guys: Would you have an idea about the problem ?
SPL load from sdcard/emmc and loaded via usb, one difference may be
cpu frequency.
I agree that the udelay() may not correct, could you help to do:
- delay 1 S or more with udelay(), then we can see if it's correct, I
don't know how the udelay is implement on rk3288,
if it's using ARM generic timer, then it's related to cpu frequency;
- using rockchip_udelay() instead of udelay(), this interface is using
rktimer, it should be correct.
I have just tried both solutions, unfortunately, it did not help (same
issues)
Thanks,
Romain
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