Hi,

‘Freeze’ means it is hung up forever, and we believe it is caused by an invalid memory access in the firmware code.

Using loading command with ‘-nc’ (no connect) will work fine, but that is kind of expected, as the issue is caused exactly by the connect logic.

We do not believe it is possible for device controller to exist without a device path protocol in the wild. Would you please provide an example? If there is something we do not know about, I can imagine introducing a PCD for this logic.

Best wishes,
Vitaly

> 13 янв. 2020 г., в 11:11, Gao, Zhichao <zhichao.gao@intel.com> написал(а):
> 
> 
> Hi,
> 
> What does 'freeze' mean? System blocked for a while or it hung up forever?
> 
> The change would affect the operation of the 'load' command. If some drivers need to connect to the device controller but it doesn't have a device path protocol, the behavior of 'load' may be incorrect.
> Is the option '-nc' working for your request?
> 
> Thanks,
> Zhichao
> 
>> -----Original Message-----
>> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
>> Vitaly Cheptsov via Groups.Io
>> Sent: Monday, January 13, 2020 5:39 AM
>> To: devel@edk2.groups.io
>> Subject: [edk2-devel] [PATCH 1/1] ShellPkg: Do not connect handles without
>> device paths
>> 
>> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2460
>> 
>> Doing this reduces the amount of needless work during device connection
>> and resolves issues with firmwares that freeze when connecting handles
>> without device paths.
>> 
>> Signed-off-by: Vitaly Cheptsov <vit9696@protonmail.com>
>> ---
>> ShellPkg/Library/UefiShellLevel2CommandsLib/Load.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/ShellPkg/Library/UefiShellLevel2CommandsLib/Load.c
>> b/ShellPkg/Library/UefiShellLevel2CommandsLib/Load.c
>> index b6e7c952fa..083aac0dba 100644
>> --- a/ShellPkg/Library/UefiShellLevel2CommandsLib/Load.c
>> +++ b/ShellPkg/Library/UefiShellLevel2CommandsLib/Load.c
>> @@ -32,8 +32,8 @@ ConnectAllEfi (
>>   UINTN       Index;
>> 
>>   Status = gBS->LocateHandleBuffer (
>> -                  AllHandles,
>> -                  NULL,
>> +                  ByProtocol,
>> +                  &gEfiDevicePathProtocolGuid,
>>                   NULL,
>>                   &HandleCount,
>>                   &HandleBuffer
>> --
>> 2.21.0 (Apple Git-122.2)
>> 
>> 
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