22 Oct
2019
22 Oct
'19
3:39 p.m.
Hi Naveen,
If you had the built-in serial enablement option off, it was the FSP which enabled the port instead of coreboot. Since FSP is called in the middle of romstage, the logs started from after-FSP part of romstage.
When built coreboot with the built-in serial port enablement, the serial port gets initialized by coreboot before FSP and befor econsole is initialized. The string:
coreboot-4.10-984-gdd4c625469-dirty Mon Oct 14 18:32:09 UTC 2019 romstage starting (log level: 7)
is actually printed by console_init(); function which is called before FSP and after built-in serial port is enabled.
Hopefully this explanation is sufficient.
Best regards,
--
Michał Żygowski
Firmware Engineer
http://3mdeb.com | @3mdeb_com
On 20.10.2019 14:22, Naveen Chaudhary wrote:
> "Enable built-in legacy serial port"
>
> After I turn this on, I get the logs since the romstage beginning
> (including fsp_init and next).
>
> But still I am not clear much, requesting some help to explain the
> scenario.
>
>
> Regards
> Naveen
> PS : with a dream to become an expert BIOS engineer
> ------------------------------------------------------------------------
> *From:* Naveen Chaudhary naveenchaudhary2010@hotmail.com
> *Sent:* Sunday, October 20, 2019 5:16 PM
> *To:* coreboot@coreboot.org coreboot@coreboot.org
> *Subject:* Re: Bootblock and Romstage logs getting skipped on first
> boot and boot continues from ramstage instead
>
> From past 5 days, I have built and flashed coreboot a 100 times and I
> could see the following line in every cold boot :
> coreboot-4.10-984-gdd4c625469-dirty Mon Oct 14 18:32:09 UTC 2019
> romstage starting (log level: 7)...
>
> Now I never see this line, but instead its always the ramstage (no
> romstage) as mentioned earlier. I have no code changes, except few
> comments as a note to myself. In both the scenarios, I boot till the
> bootloader successfully.
>
> I am surprised why I am not getting romstage logs?? I am physically
> removing the power cable for cold boot, but still no romstage logs.
> The romstage logs come only when the SeaBIOS waits for 60 seconds and
> does a hard reboot. Physically removing the power cable directly leads
> me to the ramstage.
>
> Regards,
> Naveen
> ------------------------------------------------------------------------
> *From:* Naveen Chaudhary
> *Sent:* Sunday, October 20, 2019 4:48 PM
> *To:* coreboot@coreboot.org coreboot@coreboot.org
> *Subject:* Bootblock and Romstage logs getting skipped on first boot
> and boot continues from ramstage instead
>
> Hi,
>
> The title seems pretty stupid but that's what I am observing on my
> MinnowMax. When I have built coreboot and flashed and the moment I
> connect the power cable back, I see the following logs (no romstage
> beginning logs, no console_init logs):
>
> romstage_main_continue status: 0 hob_list_ptr: 7ae20000
> FSP Status: 0x0
> PM1_STS = 0x2000 PM1_CNT = 0x0 GEN_PMCON1 = 0x1001808
> romstage_main_continue: prev_sleep_state = S0
> Baytrail Chip Variant: Bay Trail-I (ISG/embedded)
> MRC v0.102
> 1 channels of DDR3 @ 1066MHz
> CBMEM:
> IMD: root @ 7adff000 254 entries.
> IMD: root @ 7adfec00 62 entries.
> FMAP: Found "FLASH" version 1.1 at 500000.
> FMAP: base = ff800000 size = 800000 #areas = 3
> SMM Memory Map
> SMRAM : 0x7b000000 0x800000
> Subregion 0: 0x7b000000 0x700000
> Subregion 1: 0x7b700000 0x100000
> Subregion 2: 0x7b800000 0x0
> CBFS: 'Master Header Locator' located CBFS at [500200:800000)
> CBFS: Locating 'fallback/ramstage'
> CBFS: Found @ offset 2ca80 size ef16
>
>
> coreboot-4.10-984-gdd4c625469-dirty Mon Oct 14 18:32:09 UTC 2019
> ramstage starting (log level: 7)...
> Moving GDT to 7adfe900...ok
> BS: BS_PRE_DEVICE times (us): entry 0 run 2 exit 0
> CBFS: 'Master Header Locator' located CBFS at [500200:800000)
> CBFS: Locating 'cpu_microcode_blob.bin'
> CBFS: Found @ offset 1fe00 size cc00
> microcode: sig=0x30679 pf=0x1 revision=0x90c
> CPUID: 00030679
> Cores: 2
>
> However, when there is a hard reset by the SeaBIOS when there is no
> bootable device found, I get the complete logs since the romstage.
>
> No bootable device. Retrying in 60 seconds.
> Rebooting.
> In resume (status=0)
> In 32bit resume
> Attempting a hard reboot
> ACPI hard reset 1:cf9 (6)
>
>
> coreboot-4.10-984-gdd4c625469-dirty Mon Oct 14 18:32:09 UTC 2019
> romstage starting (log level: 7)... *<--- This logs does not appear
> in the first case.*
>
> Can someone please help understand this behaviour as why on the first
> boot, no ramstage log appears and then each successive reset I get the
> romstage logs, but not in the first boot.
>
> Previous sleep state reported in the logs in both the cases is S0. Am
> I just missing the logs or there is indeed something happening under
> the hood?
>
> Regards,
> Naveen
>
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