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accessing external RAM on h8s edk
- From: Marc Michalewicz <marc dot michalewicz at pixy dot ch>
- To: eCos Discussion <ecos-discuss at ecos dot sourceware dot org>
- Date: Thu, 02 Jun 2005 11:03:04 +0200
- Subject: [ECOS] accessing external RAM on h8s edk
Hi,
after getting redboot to work, I now have problems to access the
external RAM on my H8S2329-EDK board. The internal RAM is OK, e.g.
writing bytes into it via the redboot-cmdline works.
Has anybody a clue what needs to be done to access the external RAM ?
I adapted the H8S-2357 port (from Uwe Kindler) in the way that I have
changed the initialisation-code in the "platform.inc"-file (Bit EAE in
BCRL especially, but all othere REGS according to the EDK-documentation
as well), but still no success. If it helps, here is the modified
extract from my platform.inc:
INIT_REGS_DATA(CYGARC_ABWCR, 0xF0)
INIT_REGS_DATA(CYGARC_ASTCR, 0xFF)
INIT_REGS_DATA(CYGARC_BCRH, 0xD0)
INIT_REGS_DATA(CYGARC_BCRL, 0x3C)
INIT_REGS_DATA(CYGARC_WCRH, 0xFF)
INIT_REGS_DATA(CYGARC_WCRL, 0xFD)
INIT_REGS_DATA(CYGARC_MCR, 0x00)
INIT_REGS_DATA(CYGARC_DRAMCR, 0x00)
INIT_REGS_DATA(CYGARC_RTCOR, 0x00)
INIT_REGS_DATA(CYGARC_P6DDR, 0x00)
INIT_REGS_DATA(CYGARC_PADDR, 0x07)
INIT_REGS_DATA(CYGARC_PBDDR, 0xFF)
INIT_REGS_DATA(CYGARC_PCDDR, 0xFF)
INIT_REGS_DATA(CYGARC_PFDDR, 0x80)
INIT_REGS_DATA(CYGARC_PGDDR, 0x01)
INIT_REGS_DATA(CYGARC_MSTPCRL,0x00)
Do I have to modify the linkerscripts and/or other items ? Is there any
hint in any documentation ?
Thanks for any help,
Marc
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