* [ECOS] Building redboot ROM image @ 2005-08-15 18:56 Harish Kulkarni 2005-08-15 19:02 ` Gary Thomas 0 siblings, 1 reply; 4+ messages in thread From: Harish Kulkarni @ 2005-08-15 18:56 UTC (permalink / raw) To: ecos-discuss Hello, Having tuff time with rom based redboot image, please redirect me to mem-map file and section of code which does copy from rom to ram? Just by coping data section from rom to ram is suffient? PS: Prefer it to be specific to leon. -Thanks Harish Send instant messages to your online friends http://uk.messenger.yahoo.com -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [ECOS] Building redboot ROM image 2005-08-15 18:56 [ECOS] Building redboot ROM image Harish Kulkarni @ 2005-08-15 19:02 ` Gary Thomas 2005-08-16 6:37 ` Harish Kulkarni 0 siblings, 1 reply; 4+ messages in thread From: Gary Thomas @ 2005-08-15 19:02 UTC (permalink / raw) To: Harish Kulkarni; +Cc: eCos Discussion On Mon, 2005-08-15 at 19:55 +0100, Harish Kulkarni wrote: > Hello, > > Having tuff time with rom based redboot image, please > redirect me to mem-map file and section of code which > does copy from rom to ram? > > Just by coping data section from rom to ram is > suffient? > > PS: Prefer it to be specific to leon. In general, you'll need to select ROMRAM startup, not just ROM. ROM mode programs execute code directly from ROM (FLASH) and are not copied into RAM. -- ------------------------------------------------------------ Gary Thomas | Consulting for the MLB Associates | Embedded world ------------------------------------------------------------ -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [ECOS] Building redboot ROM image 2005-08-15 19:02 ` Gary Thomas @ 2005-08-16 6:37 ` Harish Kulkarni 2005-08-16 12:32 ` Gary Thomas 0 siblings, 1 reply; 4+ messages in thread From: Harish Kulkarni @ 2005-08-16 6:37 UTC (permalink / raw) To: Gary Thomas; +Cc: eCos Discussion Thanks Gary Thomas, In leon code we found only the data section is copied from ROM to RAM in ROM type start-up, which means rest of all the sections including vectors, text will get space in ROM and will not get relocated. Relocating from ROM to RAM, including vectors, text, and other sections would reduce the execution time required, which is a MUST. Is the approach of relocating sections (all) from ROM to RAM is generic or specific to processor OR board we use? ( other then changes mem-maps). If it's generic could you redirect me to such a piece of code, which is written and implemented for eCos porting, i prefer it to be specific to leon. Harish --- Gary Thomas <gary@mlbassoc.com> wrote: > On Mon, 2005-08-15 at 19:55 +0100, Harish Kulkarni > wrote: > > Hello, > > > > Having tuff time with rom based redboot image, > please > > redirect me to mem-map file and section of code > which > > does copy from rom to ram? > > > > Just by coping data section from rom to ram is > > suffient? > > > > PS: Prefer it to be specific to leon. > > In general, you'll need to select ROMRAM startup, > not just ROM. > ROM mode programs execute code directly from ROM > (FLASH) and > are not copied into RAM. > > -- > ------------------------------------------------------------ > Gary Thomas | Consulting for the > MLB Associates | Embedded world > ------------------------------------------------------------ > > > -- > Before posting, please read the FAQ: > http://ecos.sourceware.org/fom/ecos > and search the list archive: > http://ecos.sourceware.org/ml/ecos-discuss > > Send instant messages to your online friends http://uk.messenger.yahoo.com -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [ECOS] Building redboot ROM image 2005-08-16 6:37 ` Harish Kulkarni @ 2005-08-16 12:32 ` Gary Thomas 0 siblings, 0 replies; 4+ messages in thread From: Gary Thomas @ 2005-08-16 12:32 UTC (permalink / raw) To: Harish Kulkarni; +Cc: eCos Discussion On Tue, 2005-08-16 at 07:37 +0100, Harish Kulkarni wrote: > Thanks Gary Thomas, > > In leon code we found only the data section is copied > from ROM to RAM in ROM type start-up, which means rest > of all the sections including vectors, text will get > space in ROM and will not get relocated. > > Relocating from ROM to RAM, including vectors, text, > and other sections would reduce the execution time > required, which is a MUST. > > Is the approach of relocating sections (all) from ROM > to RAM is generic or specific to processor OR board we > use? ( other then changes mem-maps). > > If it's generic could you redirect me to such a piece > of code, which is written and implemented for eCos > porting, i prefer it to be specific to leon. > Support for ROMRAM is platform specific I'm afraid. You could look at some other platforms to see how it's done there. Sadly, there are no SPARC platforms which use this, so you'll have to look elsewhere (ARM, PowerPC and MIPS all support this mode). > Harish > > > > --- Gary Thomas <gary@mlbassoc.com> wrote: > > > On Mon, 2005-08-15 at 19:55 +0100, Harish Kulkarni > > wrote: > > > Hello, > > > > > > Having tuff time with rom based redboot image, > > please > > > redirect me to mem-map file and section of code > > which > > > does copy from rom to ram? > > > > > > Just by coping data section from rom to ram is > > > suffient? > > > > > > PS: Prefer it to be specific to leon. > > > > In general, you'll need to select ROMRAM startup, > > not just ROM. > > ROM mode programs execute code directly from ROM > > (FLASH) and > > are not copied into RAM. > > > > -- > > > ------------------------------------------------------------ > > Gary Thomas | Consulting for the > > MLB Associates | Embedded world > > > ------------------------------------------------------------ > > > > > > -- > > Before posting, please read the FAQ: > > http://ecos.sourceware.org/fom/ecos > > and search the list archive: > > http://ecos.sourceware.org/ml/ecos-discuss > > > > > > > Send instant messages to your online friends http://uk.messenger.yahoo.com > -- ------------------------------------------------------------ Gary Thomas | Consulting for the MLB Associates | Embedded world ------------------------------------------------------------ -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-08-16 12:32 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-08-15 18:56 [ECOS] Building redboot ROM image Harish Kulkarni 2005-08-15 19:02 ` Gary Thomas 2005-08-16 6:37 ` Harish Kulkarni 2005-08-16 12:32 ` Gary Thomas
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