Hi Mauro,
On 15.01.20 00:55, Mauro Condarelli wrote:
I found *one* of the bugs in startup:
To enable UART2 pinmux setting:
void __iomem *gpio_mode;
gpio_mode = ioremap_nocache(MT76XX_GPIO1_MODE, 0x100);
clrbits_le32(gpio_mode, GENMASK(27, 26));
is not enough; you need also:
setbits_le32(gpio_mode, GENMASK(3, 2));
I actually use the more explicit, but hopefully equivalent:
#define MT76XX_GPIO1_MODE 0x10000060
#define MIPS_KSEG1_START 0xA0000000
uint32_t v, *a;
a = (uint32_t *)(MIPS_KSEG1_START + MT76XX_GPIO1_MODE);
v = *a;
v &= 0xF3FFFFFF;
v |= 0x0000000C;
*a = v;
It is unclear to me how Linkit port could work.
I double checked on LiniIt and it works without this bit 2/3
setting:
=> md b0000060 1
b0000060: 50050404 ...P
You can check this on your VoCore2 board by setting this value
from the prompt. If this works, then its not strictly needed.
Anyways now my "secondary from ROM" approach now
works without the long delay described below.
Unfortunately this does not seem to be the whole story because
flashing u-boot linked directly in the "right palace":
SYS_TEXT_BASE = 0x9c000000
still refuses to display anything on serial; I assume some other
initialization is missing, but that will be another fight.
Any insight welcome.
Did my new image from yesterday produce any output on your board?
BTW: How do you flash the image into SPI NOR? From the new mainline
U-Boot loaded into RAM or from the ancient 1.1.3 version? Perhaps
something is going wrong in the flashing process?
Thanks,
Stefan
