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
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
"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
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,
-
Michal Zygowski -
Naveen Chaudhary -
Naveen Chaudhary