Changes between Version 29 and Version 30 of boot_loader

Timestamp:

Feb 17, 2016, 5:59:14 PM (8 years ago)

Author:

alain

Comment:

--

boot_loader

@@ -11 +11 @@
 
 After hard reset, all processors execute the same ''reset'' code (also called ''preloader'' code) stored in the external ROM. The work done depends on the processor global index: 
- * Processor P(0,0,0) loads the GIET_VM boot-loader code from the external block device, to the physical memory bank in cluster(0,0). It load the two segments seg_boot_code and seg_boot_data from the ''boot.elf'' file. This ''boot.elf'' file must be stored at (lba = 2) on the external block device. The two first BPPs (Big Physical Page) in cluster (0,0) are reserved for the four segments used by the boot-loader: ''seg_boot_mapping'', ''seg_boot_code'', ''seg_boot_stack'', and ''seg_boot_data'', and the base addresses ans sizes defined in the mapping must fit in these reserved 4 Mbytes.
+ * Processor P(0,0,0) loads the GIET_VM boot-loader code from the external block device, to the physical memory bank in cluster(0,0). It load the two segments seg_boot_code and seg_boot_data from the ''boot.elf'' file. This ''boot.elf'' file must be stored at (lba = 2) on the external block device. The first 4 Mbytes in cluster (0,0) are reserved for the four segments used by the boot-loader (''seg_boot_mapping'', ''seg_boot_code'', ''seg_boot_stack'', and ''seg_boot_data''), and the base addresses ans sizes defined in the mapping must fit in these reserved 4 Mbytes.
  * All other processors initialize their private interrupt controller, to be able to receive an inter-processor interrupt (WTI), and enter the ''wait_state'', in low-power mode.
 This ''reset'' code is generic, and can be used to boot any operating system.  
@@ -33 +33 @@
 In each cluster(x,y), processor P(x,y,0) makes the physical memory allocator initialisation (function  '''boot_pmem_init()''' ). The GIET VM uses two types of pages: BPP (Big Physical Page, 2 Mbytes), and  SPP  (Small Physical Page, 4 Kbytes).
 There is one SPP and one BPP allocator per cluster containing a physical memory bank.
-All the physical memory allocation must be done by the boot-loader in the boot phase, and these memory allocators
+All the physical memory allocation is done by the boot-loader in the boot phase, and these memory allocators
 should not be used by the kernel in the execution phase.