diff options
Diffstat (limited to 'src/arch/i386/coreboot_ram.ld')
| -rw-r--r-- | src/arch/i386/coreboot_ram.ld | 66 |
1 files changed, 36 insertions, 30 deletions
diff --git a/src/arch/i386/coreboot_ram.ld b/src/arch/i386/coreboot_ram.ld index 3915f31fd0..67c78cecbc 100644 --- a/src/arch/i386/coreboot_ram.ld +++ b/src/arch/i386/coreboot_ram.ld @@ -1,11 +1,12 @@ /* * Memory map: * - * CONFIG_RAMBASE + * CONFIG_RAMBASE : text segment + * : rodata segment * : data segment * : bss segment - * : heap * : stack + * : heap */ /* * Bootstrap code for the STPC Consumer @@ -17,10 +18,8 @@ * Rewritten by Eric Biederman * 2005.12 yhlu add coreboot_ram cross the vga font buffer handling */ -/* - * We use ELF as output format. So that we can - * debug the code in some form. - */ + +/* We use ELF as output format. So that we can debug the code in some form. */ INCLUDE ldoptions ENTRY(_start) @@ -28,9 +27,8 @@ ENTRY(_start) SECTIONS { . = CONFIG_RAMBASE; - /* - * First we place the code and read only data (typically const declared). - * This get placed in rom. + /* First we place the code and read only data (typically const declared). + * This could theoretically be placed in rom. */ .text : { _text = .; @@ -39,6 +37,7 @@ SECTIONS . = ALIGN(16); _etext = .; } + .rodata : { _rodata = .; . = ALIGN(4); @@ -54,17 +53,14 @@ SECTIONS ecpu_drivers = . ; *(.rodata) *(.rodata.*) - /* - * kevinh/Ispiri - Added an align, because the objcopy tool + /* kevinh/Ispiri - Added an align, because the objcopy tool * incorrectly converts sections that are not long word aligned. - * This breaks the coreboot.rom target. */ . = ALIGN(4); _erodata = .; } - /* - * After the code we place initialized data (typically initialized + /* After the code we place initialized data (typically initialized * global variables). This gets copied into ram by startup code. * __data_start and __data_end shows where in ram this should be placed, * whereas __data_loadstart and __data_loadend shows where in rom to @@ -76,18 +72,7 @@ SECTIONS _edata = .; } - .sdata : { - _SDA_BASE_ = .; - *(.sdata) - } - - .sdata2 : { - _SDA2_BASE_ = .; - *(.sdata2) - } - - /* - * bss does not contain data, it is just a space that should be zero + /* bss does not contain data, it is just a space that should be zero * initialized on startup. (typically uninitialized global variables) * crt0.S fills between _bss and _ebss with zeroes. */ @@ -99,6 +84,11 @@ SECTIONS } _ebss = .; _end = .; + + /* coreboot really "ends" here. Only heap and stack are placed after + * this line. + */ + . = ALIGN(CONFIG_STACK_SIZE); _stack = .; @@ -107,6 +97,7 @@ SECTIONS . += CONFIG_MAX_CPUS*CONFIG_STACK_SIZE; } _estack = .; + _heap = .; .heap . : { /* Reserve CONFIG_HEAP_SIZE bytes for the heap */ @@ -115,18 +106,33 @@ SECTIONS } _eheap = .; + /* Some assertions to print human readable errors for certain linker + * error scenarios. + */ + /* Avoid running into 0xa0000-0xfffff */ _bogus = ASSERT(CONFIG_RAMBASE >= 0x100000 || _eheap < 0xa0000, "Please move RAMBASE to 1MB"); - /* The ram segment - * This is all address of the memory resident copy of coreboot. + /* The ram segment. This includes all memory used by the memory + * resident copy of coreboot, except the tables that are produced on + * the fly, but including stack and heap. */ _ram_seg = _text; _eram_seg = _eheap; - _bogus = ASSERT( ( _eram_seg < (CONFIG_RAMTOP)) , "please increase CONFIG_RAMTOP"); + /* CONFIG_RAMTOP is the upper address of cached memory (among other + * things). We must not exceed beyond that address, there be dragons. + */ + _bogus = ASSERT( ( _eram_seg < (CONFIG_RAMTOP)) , "Please increase CONFIG_RAMTOP"); + + /* This rule is only good for the few broken targets that still live + * below 1MB per default. Those are the Geode and VIA targets that come + * with their own version of real mode switches that can't live above + * 1MB. Once these are fixed, this rule should go away. + */ + _bogus = ASSERT( !((CONFIG_CONSOLE_VGA || CONFIG_PCI_ROM_RUN || CONFIG_VGA_ROM_RUN || CONFIG_HAVE_SMI_HANDLER) && ((_ram_seg<0xa0000) && (_eram_seg>0xa0000))), "Please increase CONFIG_RAMTOP and if still fail, try to set CONFIG_RAMBASE to 1M"); - _bogus = ASSERT( !((CONFIG_CONSOLE_VGA || CONFIG_PCI_ROM_RUN) && ((_ram_seg<0xa0000) && (_eram_seg>0xa0000))) , "please increase CONFIG_RAMTOP and if still fail, try to set CONFIG_RAMBASE more than 1M"); + /* Discard the sections we don't need/want */ /DISCARD/ : { *(.comment) |