Changes between Version 1 and Version 2 of venice/bootloader

Timestamp:

03/25/2024 05:27:54 PM (7 weeks ago)

Author:

Tim Harvey

Comment:

added a memory map for boot firmware

venice/bootloader

@@ -3 +3 @@
 
 [=#u-boot]
-== Venice U-Boot Bootloader
+= Venice U-Boot Bootloader
 Gateworks supports the U-Boot Bootloader for the Venice product family.
 
@@ -25 +25 @@
 
 
+== Editing the environment
+If you would like to modify the default environment you can edit the [https://github.com/Gateworks/bsp-venice/blob/master/venice.env venice/venice.env] in the Venice BSP.
+
 [=#default]
-== Restoring defaults 
+== Restoring environment defaults 
 The Venice boot firmware has a copy of the original U-Boot env that was created during build time.
 
@@ -38 +41 @@
 }}}
 
-== Editing the environment
-If you would like to modify the default environment you can edit the [https://github.com/Gateworks/bsp-venice/blob/master/venice.env venice/venice.env] in the Venice BSP.
+[=#memmap]
+== Memory Mapping
+When working with boot firmware you are often dealing with choosing where to load in memory various components. Sometimes this is done by hard-coding addresses into U-Boot commands, using env variables, or hard coding them into the U-Boot build configuration files (ie binman node) or FIT image templates.
+
+Here is what we recommend for memory mapping on the IMX8M{M,N,P} SoC's:
+||= address   =||= var =||= Note =||
+|| 0x00920000  || || ARM Trusted Firmware ||
+|| 0x40000000  || || base of DRAM ||
+|| 0x40200000  || kernel_comp_addr_r || CONFIG_TEXT_BASE: base of non-secure memory<BR>The ATF configures the first 2M of DRAM as secure for itself ||
+|| 0x40310000  || || binman_fip image gets put here
+|| 0x44000000  || || CONFIG_SPL_LOAD_FIT_ADDRESS (used for secure boot)
+|| 0x48200000  || loadaddr, kernel_addr_r || CONFIG_SYS_LOAD_ADDR 
+|| 0x50200000  || fdt_addr_r || area for loading fdt (128M above kernel_addr_r)
+|| 0x50300000  || scriptaddr || area for loading script (512K above fdt_addr_r)
+|| 0x7e000000  || || CFG_TZDRAM_START (secure boot with TEE; for 1GB DRAM boards)
+|| 0x80000000  || || 1GB boundary ||
+|| 0xbe000000  || || CFG_TZDRAM_START (secure boot with TEE; for 2GB DRAM boards)
+|| 0xc0000000  || || 2GB boundary 
+|| 0xfe000000  || || CGG_TZDRAM_START (secure boot with TEE; for 4GB DRAM boards)
+|| 0x100000000 || || 3GB boundary ||
+|| 0x140000000 || || 4GB boundary ||