Hi Samer,
One remark inline:
On 2020.06.13 14:41, Samer El-Haj-Mahmoud wrote:
Add a section to the the RPi4 Readme for 'Configuration Settings', with
instructions on scripting from the UEFI Shell.
Cc: Leif Lindholm <l...@nuviainc.com>
Cc: Ard Biesheuvel <ard.biesheu...@arm.com>
Cc: Pete Batard <p...@akeo.ie>
Cc: Andrei Warkentin <awarken...@vmware.com>
Signed-off-by: Samer El-Haj-Mahmoud <samer.el-haj-mahm...@arm.com>
---
Platform/RaspberryPi/RPi4/Readme.md | 74 +++++++++++++++++++-
1 file changed, 73 insertions(+), 1 deletion(-)
diff --git a/Platform/RaspberryPi/RPi4/Readme.md
b/Platform/RaspberryPi/RPi4/Readme.md
index 03eb6c391aca..d27465d965ab 100644
--- a/Platform/RaspberryPi/RPi4/Readme.md
+++ b/Platform/RaspberryPi/RPi4/Readme.md
@@ -143,4 +143,76 @@ all functionality may be available.
- Network booting via onboard NIC.
- SPCR hardcodes type to PL011, and thus will not expose correct
- (miniUART) UART if DT overlays to switch UART are used on Pi 4B.
\ No newline at end of file
+ (miniUART) UART if DT overlays to switch UART are used on Pi 4B.
+
+# Configuration Settings
+The Raspberry Pi UEFI configuration settings can be viewed and changed using both
the UI configuration menu (under `Device Manager` -> `Raspberry Pi
Configuration`), as well as the UEFI Shell. To configure using the UEFI Shell, use
`setvar` command to read/write the UEFI variables with GUID =
`CD7CC258-31DB-22E6-9F22-63B0B8EED6B5`.
+
+The syntax to read a setting is:
+```
+setvar <NAME> -guid CD7CC258-31DB-22E6-9F22-63B0B8EED6B5
+```
+
+The syntax to write a setting is:
+```
+setvar <NAME> -guid CD7CC258-31DB-22E6-9F22-63B0B8EED6B5 -bs -rt -nv =<VALUE>
+```
+
+For string-type settings (e.g. Asset Tag), the syntax to write is:
+```
+setvar <NAME> -guid CD7CC258-31DB-22E6-9F22-63B0B8EED6B5 -bs -rt -nv
=L"<VALUE>" =0x0000
+```
+
+UEFI Setting | NAME | VALUE
+-----------------------------|-----------------------|-----------------------------
+**CPU Configuration** |
+CPU Clock | `CpuClock` | Low = `0x00000000`<br> Default = `0x00000001`
(default)<br> Max = `0x00000002`<br> Custom = `0x00000003`
+CPU Clock Rate (MHz) | `CustomCpuClock` | Hex numeric value,
4-bytes<br> (e.g. `0x000005DC` for 1500 MHz)
+**Display Configuration** |
+Virtual 640x480 | `DisplayEnableScaledVModes` | Checked = Bit 0 set
(i.e. `<DisplayEnableScaledVModes> | 0x01`
1. A closing parenthesis is missing at the end.
2. A backslash must be added before the pipe in the last code section,
or else it won't display.
This is due to https://github.com/github/markup/issues/1078.
In other words, you need to have:
`<DisplayEnableScaledVModes> \| 0x01`
+Virtual 800x600 | `DisplayEnableScaledVModes` | Checked = Bit 1 set
(i.e. `<DisplayEnableScaledVModes> | 0x02`
+Virtual 1024x768 | `DisplayEnableScaledVModes` | Checked = Bit 2 set
(i.e. `<DisplayEnableScaledVModes> | 0x04`
+Virtual 720p | `DisplayEnableScaledVModes` | Checked = Bit 3 set
(i.e. `<DisplayEnableScaledVModes> | 0x08`
+Virtual 1080p | `DisplayEnableScaledVModes` | Checked = Bit 4 set
(i.e. `<DisplayEnableScaledVModes> | 0x10`
+Native resolution | `DisplayEnableScaledVModes` | Checked = Bit 5 set
(i.e. `<DisplayEnableScaledVModes> | 0x20` (default)
Same as above for these 5 lines.
Regards,
/Pete
+Screenshot support | `DisplayEnableSShot` | Control-Alt-F12 = `0x00000001`
(default)<br> Not Enabled = `0x00000000`
+**Advanced Configuration** |
+Limit RAM to 3 GB | `RamLimitTo3GB` | Disable = `0x00000000` <br>
Enabled= `0x00000001` (default)
+System Table Selection | `SystemTableMode`| ACPI = `0x00000000` (default)<br>
ACPI + Devicetree = `0x00000001` <br> Devicetree = `0x00000002`
+Asset Tag | `AssetTag` | String, 32 characters or less (e.g.
`L"ABCD123"`)<br> (default `L""`)
+**SD/MMC Configuration** |
+uSD/eMMC Routing | `SdIsArasan` | Arasan SDHC = `0x00000001` (default)
<br> eMMC2 SDHCI = `0x00000000`
+Multi-Block Support | `MmcDisableMulti` | Multi-block transfers =
`0x00000000` (default)<br> Single block transfers = `0x00000001`
+uSD Max Bus Width | `MmcForce1Bit` | 4-bit Mode = `0x00000000`
(default)<br> 1-bit Mode = `0x00000001`
+uSD Force Default Speed | `MmcForceDefaultSpeed` | Allow High Speed =
`0x00000000` (default)<br> Force Default Speed = `0x00000001`
+SD Default Speed (MHz) | `MmcSdDefaultSpeedMHz` | Hex numeric value, 4-bytes
(e.g. `0x00000019` for 25 MHz)<br>(default 25)
+SD High Speed (MHz) | `MmcSdHighSpeedMHz` | Hex numeric value, 4-bytes
(e.g. `0x00000032` for 50 MHz)<br>(default 50)
+**Debugging Configuration** |
+JTAG Routing | `DebugEnableJTAG` | Enable JTAG via GPIO =
`0x00000001`<br> Disable JTAG= `0x00000000` (default)
+
+**Examples:**
+
+- To read the 'System Table Selection' setting :
+```
+setvar SystemTableMode -guid CD7CC258-31DB-22E6-9F22-63B0B8EED6B5
+```
+
+- To change the 'System Table Selection' setting to 'Devicetree' :
+```
+setvar SystemTableMode -guid CD7CC258-31DB-22E6-9F22-63B0B8EED6B5 -bs -rt -nv
=0x00000002
+```
+
+- To read the 'Limit RAM to 3 GB' setting:
+```
+setvar RamLimitTo3GB -guid CD7CC258-31DB-22E6-9F22-63B0B8EED6B5
+```
+
+- To change the 'Limit RAM to 3 GB' setting to 'Disabled':
+```
+setvar RamLimitTo3GB -guid CD7CC258-31DB-22E6-9F22-63B0B8EED6B5 -bs -rt -nv
=0x00000000
+```
+
+- To change the Asset Tag to the string "ASSET-TAG-123" :
+```
+setvar AssetTag -guid CD7CC258-31DB-22E6-9F22-63B0B8EED6B5 -bs -rt -nv
=L"ASSET-TAG-123" =0x0000
+```
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