From: Liu Pedroa <pedroa.liu@outlook.com>
To: "Kirkendall, Garrett" <Garrett.Kirkendall@amd.com>,
"edk2-devel@lists.01.org" <edk2-devel@lists.01.org>
Subject: 答复: Question for memory type: EfiReservedMemoryType
Date: Wed, 22 Feb 2017 01:56:17 +0000 [thread overview]
Message-ID: <HKXPR02MB1863C607F46C72269CDBB0A88F500@HKXPR02MB1863.apcprd02.prod.outlook.com> (raw)
In-Reply-To: <DM2PR12MB0154BB6BEC9F12022129884D855D0@DM2PR12MB0154.namprd12.prod.outlook.com>
According to ACPI 6.1 Spec :
Platform runtime firmware can use the AddressRangeReserved address range type to block out
various addresses as not suitable for use by a programmable device. Some of the reasons a platform
runtime firmware would do this are:
? The address range contains system ROM.
? The address range contains RAM in use by the ROM.
? The address range is in use by a memory-mapped system device.
? The address range is, for whatever reason, unsuitable for a standard device to use as a device
memory space.
? The address range is within an NVRAM device where reads and writes to memory locations are
no longer successful, that is, the device was worn out.
-----邮件原件-----
发件人: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] 代表 Kirkendall, Garrett
发送时间: 2017年2月17日 23:55
收件人: edk2-devel@lists.01.org
主题: [edk2] Question for memory type: EfiReservedMemoryType
The UEFI spec says:
EfiReservedMemoryType - Not usable.
Some people take this to mean that you should not use this memory type. Some think it will mark the memory as unusable by UEFI or OS.
Could the spec be updated to be more precise as to the meaning?
As far as I can tell, the code will allocate memory of type EfiReservedMemoryType and will not use that memory.
Garrett Kirkendall
SMTS Firmware Engineer | CTE
7171 Southwest Parkway, Austin, TX 78735 USA
AMD facebook<https://www.facebook.com/AMD> | amd.com<http://www.amd.com/>
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prev parent reply other threads:[~2017-02-22 1:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-17 15:55 Question for memory type: EfiReservedMemoryType Kirkendall, Garrett
2017-02-17 16:13 ` Andrew Fish
2017-02-22 1:56 ` Liu Pedroa [this message]
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