Re: [openbmc-qemu]: Add read mac from eeprom in uboot by i2c and lead to the image unable to start in QEMU?

Re: [openbmc-qemu]: Add read mac from eeprom in uboot by i2c and lead to the image unable to start in QEMU?

[Andrew Jeffery]

Hi Byron,

I've Cc'ed the openbmc mailing list on this reply.

On Tue, 25 May 2021, at 17:50, www wrote:
> 
> 
> At 2021-05-24 08:22:58, "Andrew Jeffery" <andrew@aj.id.au> wrote:
> >Hi Byron
> >
> >On Sat, 22 May 2021, at 19:32, www wrote:
> >> Hi Andrew Jeffery, Joel Stanley & Cédric Le Goater,
> >> 
> >> chip：aspeed 2500
> >> uboot ： u-boot-2016.07  commit-id: cc6c5bef00ebbac0b37
> >> platform: romulus
> >> 
> >> I enable read mac from eeprom by i2c in uboot, and lead to  the image 
> >> unable to start  in QEMU. The startup process stops at "Starting kernel 
> >> ...“
> >> I'd like to ask:
> >> 1. How can I solve this problem? Do you have any suggestions?
> >
> >Can you please configure your kernel with the following and re-run?
> >
> > CONFIG_DEBUG_LL=y
> > CONFIG_DEBUG_LL_UART_8250=y
> > CONFIG_DEBUG_UART_PHYS=0x1e784000
> > CONFIG_DEBUG_UART_VIRT=0xf8184000
> >
> I set up these four items and didn't print any information.
> then I add "*#define DEBUG*" in the file of *arch/arm/boot/compressed/head.S*, 
> It's just one more line printed.

Sorry, I failed to mention that you also need to add 'debug' and 
'earlyprintk' to your kernel commandline (i.e. append them to the 
'bootargs' u-boot environment variable) for the CONFIG_DEBUG_* bits 
above to be useful.

Let me know if that helps.

Andrew

> 
> thanks,
> Byron
> 
> >This allows us to see the kernel log before the UART driver is probed.
> >
> >Also, please ask these questions on the mailing list. Other people 
> >might have similar problems and so a public discussion will help them 
> >too. Posting publicly can help you also, because you're relying on at 
> >least one of the three of us to reply to you in a reasonable timeframe. 
> >If your question is public anyone who has the skills and time can chime 
> >in to help you out.
> >
> >Andrew
> 
> 
>  
> 
> Attachments:
> * image.png