[U-Boot-Users] questions regarding support for new command (getspr/setspr)
wd at denx.de
Wed Jan 28 10:20:09 CET 2004
In message <D8A54727-5154-11D8-A361-000393DBC2E8 at motorola.com> you wrote:
> I was wondering if it was considered useful to extend the
> CFG_CMD_SETGETDCR done by Erik Theisen for DCR registers on the 4xx
> family to all PowerPC products for SPRs (CFG_CMD_SETGETSPR).
That would be useful.
> 1. Is it ok that the command does not do any checking on the SPR
> number. This is quick difficult and would have to be done per
> processor since what SPRs exists is implementation specific. If the
> user gives the commands an SPR that does not exist the result is going
> to be some exception (is this ok)
IMHO only valid SPRs should be accepted. Yes, this requires processor
> 2. What numerical format should the spr number for the command be taken
> in? My think is decimal
The format should be string (i. e. register NAME). For SPRs without a
name and/or alternatively a decimal number is ok. Without a register
name/number the "get" command should print all known SPR's on that
> 3. For setspr what numerical format should the spr value be taken in?
> My thinking is hex
Hex like all standard input data in U-Boot.
> 4. For getspr what numerical format should the spr be printed in? My
> thinking is hex
The register name should be string plus decimal number; the value
should be hex.
> If so, I will fixup my working patch and submit it once I get answers
> to the questions.
Thanks in advance.
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